Arista Networks vs. IBM: Which Technology Stock Is a Better Buy for 2027?

High-growth networking or a legacy tech transformation? Choosing between Arista Networks (NYSE:ANET) and International Business Machines (NYSE:IBM) means deciding between rapid cloud infrastructure expansion and a steady hybrid cloud and software pivot.

Arista Networks provides the networking backbone for massive data centers, while International Business Machines offers a broader suite of enterprise software and consulting services. Both companies are navigating the industrywide shift toward artificial intelligence. This comparison examines their growth, financial health, and risks to help you determine which stock is better for 2027.

The case for Arista Networks

Arista Networks sells high-speed networking equipment to data center operators and cloud providers. It focuses on a software-driven approach to networking, which differentiates it from traditional hardware-centric competitors. Customer concentration like this adds a layer of risk to the business, as it depends heavily on a few large cloud titans.

In the 12 months ended Sept. 30, 2026, revenue reached around $11.9 billion, representing growth of roughly 41%. Net income was approximately $4.8 billion, resulting in a net margin of close to 40%. This growth is driven by the rapid expansion of data centers required to process information for the latest tech stocks.

As of its December 2025 balance sheet, the debt-to-equity ratio is 0.0x, a metric that compares total debt to shareholder equity. Its current ratio is close to 3.0x, indicating the company has ample short-term assets to cover its immediate obligations. In the fiscal year ended Dec. 31, 2025, free cash flow was about $4.3 billion, which allows the company to reinvest in new networking technologies.

The case for International Business Machines

International Business Machines provides software, consulting, and infrastructure solutions for the modern enterprise. Its strategy focuses on hybrid cloud and artificial intelligence, helping clients integrate various computing environments. The company leverages a massive ecosystem of strategic partners, including Oracle Corp. (NYSE:ORCL) and SAP (NYSE:SAP), to deliver end-to-end solutions.

In the 12 months ended Sept. 30, 2026, revenue reached around $69.9 billion, reflecting growth of about 6.8%. Net income was roughly $11.2 billion for the same period, with a net margin of approximately 16%. While its growth rate is more modest than some high-flying tech peers, the company maintains a massive base of recurring software revenue.

As of its December 2025 balance sheet, the debt-to-equity ratio is approximately 2.1x. This metric compares total debt to shareholder equity to measure a firm's financial structure. The current ratio is roughly 0.9x, and in the fiscal year ended Dec. 31, 2025, free cash flow reached around $12.1 billion.

Risk profile comparison

Arista Networks faces significant risk from customer concentration, with a limited number of large customers accounting for a substantial portion of revenue. It also relies on sole or limited-source suppliers for merchant silicon, which can lead to supply chain vulnerabilities. Geopolitical tensions and tariffs could further impact its manufacturing and distribution costs.

International Business Machines faces intense competition from Alphabet Inc. (NASDAQ:GOOGL) and other major software providers. The company must successfully innovate in the hybrid cloud market to maintain its market share against these rivals. Additionally, managing its vast global operations exposes it to various regulatory and cybersecurity risks.

Valuation comparison

International Business Machines appears much cheaper than Arista Networks based on its Forward P/E and P/S ratio metrics.

Valuation metrics include those sourced from Financial Modeling Prep (FMP) and may differ from those of other data providers.

Which stock would I buy for 2027?

IBM stumbled earlier this year when it announced price increases to its mainframe customers, leading customers to switch to other providers, crimping revenue in the current fiscal year's second quarter. Still, third-quarter sales exceeded expectations, at $17.1 billion. while net income disappointed compared to analyst consensus at $2.1 billion. Both were still up modestly from the year-ago period.

Still, demand for generative AI and cloud solutions is helping IBM. In particular, AI is instrumental to IBM's future. The belief is that many of the company's extensive roster of enterprise technology clients are seeking to upgrade their IT infrastructure with a trusted partner--IBM.

For the current fiscal year, revenue will grow only slightly, from $68 billion to about $70.6 billion, with net income seen ticking down by about $1 billion to around $9.6 billion, according to consensus estimates.

Arista Networks is experiencing strong demand for its Ethernet solutions as AI drives growth in cloud networking. Cloud Titans, a term for the largest AI operations, increased their spending by 30% in 2025 after a 30% increase in 2024. Arista is a big beneficiary of their spending and should continue to be. In addition to double-digit revenue growth for Arista from Titans, the company is seeing strong momentum in the Arista campus and mainstream switching and routing markets as it introduces and updates a slew of product offerings targeting those operations.

For fiscal 2026, revenue is expected to jump nearly 40% to $12.6 billion, with net income rising by a similar margin to $4.9 billion.

IBM is priced much more reasonably, but Arista offers significant growth for its premium. IBM's sluggish sales growth in the age of AI is a concern, so the better buy here for 2027 is Arista.

Brendan Coffey has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends Alphabet, Arista Networks, International Business Machines, and Oracle. The Motley Fool has a disclosure policy.