Quanta vs. MasTec: Which Infrastructure Stock Is the Better Buy?

The U.S. infrastructure spending cycle remains firmly intact, supported by accelerating investments in electric grid modernization, data centers, AI infrastructure, broadband expansion and energy projects. As utilities, hyperscalers and governments increase capital expenditures, engineering and construction companies with diversified capabilities are positioned to benefit from years of sustained demand. Quanta Services PWR and MasTec MTZ stand out as two of the industry's strongest players. Both delivered exceptional first-quarter 2026 results, raised full-year guidance and highlighted record backlogs, reflecting robust customer demand across multiple end markets. Yet, despite serving similar markets, their growth strategies, profitability drivers and valuation profiles differ meaningfully.Let's dive deep and closely compare the fundamentals of the two stocks to determine which one is a better investment now.The Case for Quanta StockQuanta continues to strengthen its position as the premier provider of mission-critical infrastructure solutions by capitalizing on long-duration investments in electric transmission, grid modernization, renewable energy, communications, and rapidly expanding data center infrastructure. The company reported record first-quarter revenues of $7.87 billion, up 26% year over year, while adjusted earnings per share (EPS) jumped to $2.68 from $1.78. Total backlog reached an all-time high of $48.5 billion, providing excellent revenue visibility. Encouraged by strong execution and improving visibility, management raised substantially all full-year financial guidance.Perhaps the biggest differentiator for Quanta is its integrated solutions model. Rather than serving only as an engineering contractor, the company increasingly provides customers with comprehensive infrastructure solutions, including engineering, procurement, manufacturing, fabrication, logistics and construction. This integrated approach has made Quanta an indispensable partner for utilities and hyperscale customers that require execution certainty on increasingly complex projects.AI-driven electricity demand is emerging as another major growth catalyst. Management believes utilities could effectively double in size over time as power demand from AI data centers accelerates. To support this opportunity, Quanta is investing $500-$700 million to double transformer manufacturing capacity while significantly expanding its fabrication and supply-chain capabilities. The company believes these investments position it to benefit from an estimated $2.4 trillion addressable market through 2030.Quanta also benefits from exceptional operational discipline. Management continues targeting 15%-20% annual adjusted EPS growth through 2030 while simultaneously expanding margins and maintaining an investment-grade balance sheet. The company's diversified exposure across electric infrastructure, communications, renewable energy and large-load facilities reduces dependence on any single end market.Challenges remain. Quanta trades at a premium valuation, raising expectations for flawless execution. Large fixed-price infrastructure projects always carry execution risks, while permitting delays, supply-chain disruptions, labor shortages and higher project costs could affect project timing. Nevertheless, Quanta's scale, vertical integration and longstanding customer relationships help mitigate many of these risks.The Case for MasTec StockMasTec has emerged as one of the fastest-growing infrastructure contractors, benefiting from accelerating investments across communications, power delivery, pipeline infrastructure and clean energy. First-quarter revenues surged 34% year over year to a record $3.83 billion, while adjusted EBITDA increased 73% and adjusted EPS jumped 174%. The company also reported a record 18-month backlog of $20.3 billion and raised its full-year 2026 guidance.One of MasTec's biggest strengths is its broad exposure to multiple high-growth infrastructure themes. AI is boosting demand for data center construction, fiber connectivity and electric transmission simultaneously. Management highlighted growing opportunities in turnkey data center construction, utility transmission projects and telecom interconnectivity as AI workloads continue expanding. Power Delivery backlog reached record levels after posting a 1.6x book-to-bill ratio, while Clean Energy and Infrastructure backlog continued growing at an impressive pace.Pipeline Infrastructure has become another important growth engine. Revenues nearly doubled year over year as growing LNG exports and rising natural gas-fired generation support long-term pipeline investments. Management also noted that project visibility remains stronger than reflected in the reported backlog because many awards are still under negotiation.Operational execution has improved significantly as well. Margin expansion across Power Delivery, Pipeline Infrastructure and Clean Energy demonstrates improving project selection, better productivity and greater operating leverage. Customers increasingly prefer MasTec for alliance agreements, sole-source contracts and turnkey infrastructure delivery, strengthening future growth prospects.However, MasTec faces its own challenges. Pipeline activity remains somewhat dependent on regulatory approvals and customer timing. Communications margins continue facing pressure from certain legacy businesses, while acquisitions and expansion into new markets create integration risks. Compared with Quanta, MasTec also has relatively greater exposure to project timing within pipeline and renewable energy markets, making quarterly results somewhat more cyclical.PWR vs MTZ: Market Momentum Favors Both Infrastructure LeadersBoth stocks have dramatically outperformed the broader market in 2026. MasTec has gained an impressive 97.4% year to date (YTD), while Quanta has climbed 69.2%. These gains far exceed the Zacks Construction sector's 17.8% advance and the S&P 500's 7.3% rise, reflecting investors' confidence in AI-driven infrastructure spending.PWR vs MTZ Price Performance (YTD)Image Source: Zacks Investment ResearchAmong other infrastructure peers, Comfort Systems USA FIX and EMCOR Group EME have also benefited from data center and electrification investments, reinforcing the industry's favorable backdrop, gaining 108.8% and 33.1% YTD, respectively. However, MasTec's stronger share price appreciation suggests investors are rewarding its faster earnings acceleration, while Quanta continues attracting premium-quality investors because of its superior execution consistency and long-duration growth profile.PWR vs MTZ: Premium Multiples Reflect Strong Growth ExpectationsNeither stock appears inexpensive. Quanta trades at 46.89X forward 12-month earnings, while MasTec trades at 41.03X. Both command substantial premiums over the Zacks Construction sector average of 22.22X.PWR vs MTZ Valuation (P/E F12M)Image Source: Zacks Investment ResearchCompared with EMCOR (26.2X) and Comfort Systems (40.9X), both companies also trade at elevated valuations because investors expect sustained earnings growth from AI infrastructure, grid modernization and power demand.Although MasTec offers the lower multiple, Quanta arguably deserves its premium due to its larger backlog, integrated business model, stronger balance sheet, expanding manufacturing capabilities and exceptional long-term visibility.Earnings Revisions Continue Moving HigherAnalysts have become increasingly optimistic about both companies following their first-quarter results. Over the past 60 days, the Zacks Consensus Estimate for Quanta's 2026 EPS increased to $14.03 from $13.16. Earnings are expected to grow 30.5% on 22.1% revenue growth this year, followed by another 17.3% EPS increase on 12.5% revenue growth in 2027.PWR EPS Estimate RevisionImage Source: Zacks Investment ResearchMasTec's earnings revisions have also moved higher. The Zacks Consensus Estimate for 2026 EPS increased to $8.90 from $8.56 during the past 60 days, implying 35.9% annual growth on 22.5% revenue growth. For 2027, analysts expect another impressive 35.3% EPS increase alongside 11.1% revenue growth.MasTec clearly enjoys the faster near-term earnings growth outlook. However, Quanta's earnings trajectory appears more balanced and supported by longer-duration opportunities, making its growth profile arguably more sustainable.MTZ EPS Estimate RevisionImage Source: Zacks Investment ResearchWhich Stock Looks Like the Better Buy?Both companies remain exceptionally well-positioned to benefit from the multiyear infrastructure investment cycle fueled by AI, electrification, grid modernization and energy security. MasTec offers faster earnings growth, strong operational momentum and broader exposure to several rapidly expanding infrastructure markets. Its lower valuation also provides some relative appeal.However, Quanta, sporting a Zacks Rank #1 (Strong Buy), stands out because of its unmatched execution capabilities, record $48.5 billion backlog, vertically integrated operating model, expanding manufacturing footprint and superior long-term visibility. Its investments in transformer manufacturing, fabrication capacity and integrated supply-chain solutions further strengthen its competitive advantage as customers increasingly prioritize execution certainty on complex infrastructure projects. MasTec currently carries a Zacks Rank #3 (Hold).  You can see the complete list of today’s Zacks #1 Rank stocks here.Overall, Quanta appears better positioned to deliver more durable long-term shareholder returns, making it the more attractive infrastructure stock for investors seeking a combination of growth, execution consistency and earnings visibility.Radical New Technology Could Hand Investors Huge GainsQuantum Computing is the next technological revolution, and it could be even more advanced than AI.While some believed the technology was years away, it is already present and moving fast. 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