Archer Aviation vs. Rocket Lab: Which Aerospace Stock Is a Better Buy in 2026?

Investing in the future of flight often means choosing between the Earth's atmosphere and the vacuum of space. Can Archer Aviation (NYSE:ACHR) or Rocket Lab (NASDAQ:RKLB) deliver better long-term results?

Archer Aviation focuses on urban air mobility with its electric vertical takeoff and landing aircraft. Rocket Lab provides reliable access to orbit through its launch services and satellite components. While both operate in the high-stakes world of aerospace, they face different regulatory hurdles and market opportunities. We will compare their financials, growth trajectories, and risks to see which stands out.

The case for Archer Aviation

Archer Aviation focuses on the electric vertical takeoff and landing (eVTOL) market, aiming to revolutionize urban transportation with its Midnight aircraft. The company maintains a massive conditional purchase agreement with United Airlines for up to $1.5 billion worth of aircraft, contingent on regulatory milestones. Its manufacturing partner, Stellantis (NYSE:STLA), provides capital and automotive expertise, while its 2026 acquisition of Boeing (NYSE:BA) subsidiaries added a profitable business among defense stocks. This reliance on a few major agreements means that customer concentration like this adds a layer of risk to the business.

In FY 2025, revenue reached nearly $300,000 as the company began its early commercialization efforts. While this is a step forward from zero revenue in previous years, the company reported a net loss of approximately $618.2 million for the period. This resulted in a net margin of roughly negative 206,066.7% as the business remains in its pre-revenue developmental phase. High development costs for its Midnight aircraft continue to weigh on the bottom line as it works toward FAA certification.

As of its December 2025 balance sheet, the debt-to-equity ratio is roughly 0.1x. This ratio measures total debt against shareholder equity, where a low number indicates limited reliance on borrowing compared to its ownership base. The current ratio, which tracks short-term liquidity by comparing current assets to liabilities, is nearly 19.9x. Free cash flow was negative $511.7 million, calculated as operating cash flow minus capital expenditures, as Archer Aviation continues to invest in its production facilities.

The case for Rocket Lab

Rocket Lab has established itself as a leader in the launch services and spacecraft segments through its Electron rocket. The company serves a diverse group of government agencies, including NASA and the U.S. Department of War, providing both launch capabilities and satellite components. It is currently expanding its reach through the pending acquisition of Iridium Communications (NASDAQ:IRDM), which would transform the business into a vertically integrated space giant. Customer concentration like this adds a layer of risk to the business, as a significant portion of revenue comes from a small group of government and commercial partners.

For FY 2025, revenue reached approximately $601.8 million, representing a 38% increase over the previous year. Despite this growth, the company reported a net loss of nearly $198.2 million, resulting in a net margin of negative 32.9%. Losses are narrowing as a percentage of revenue, suggesting the company is gaining scale in its segments as it moves toward the launch of its larger Neutron rocket.

Based on its December 2025 balance sheet, the debt-to-equity ratio is about 0.1x. This metric compares total debt to shareholder equity to show how a company funds its operations through debt versus its own assets. The current ratio is roughly 4.1x, suggesting the company has enough liquid assets to cover its short-term liabilities. Free cash flow was nearly negative $321.8 million, representing the cash remaining after the company pays for its operations and capital equipment.

Risk profile comparison

Archer Aviation faces significant regulatory risks as it waits for FAA certification for its eVTOL aircraft, competing against rivals like Joby Aviation (NYSE:JOBY). Certification delays or failures would prevent the company from starting commercial operations and generating meaningful revenue. Furthermore, the company has no experience with high-volume manufacturing and faces challenges scaling production and supply chains to meet global demand.

Rocket Lab is heavily dependent on the technical performance of its Electron rocket, where any launch failure could damage its reputation compared to Northrop Grumman (NYSE:NOC). It also relies on government contracts, meaning changes in federal funding or procurement procedures could result in significant contract cancellations or funding reductions. Finally, the acquisition of Iridium Communications poses integration risks that could divert management attention or fail to achieve the anticipated synergies.

Valuation comparison

Rocket Lab appears more established with a measurable Forward P/E based on earnings estimates, while Archer Aviation trades at a high P/S ratio.

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

Which stock would I buy in 2026?

I'd go with Rocket Lab, and it's not a close call. While Archer Aviation is still working toward its first commercial flight, Rocket Lab is already building one of the most impressive backlogs in the emerging space economy, crossing $2 billion in 2026. And its Neutron rocket program adds a larger launch vehicle that could dramatically expand its addressable market.

Archer Aviation is making progress, with its FAA certification advancing faster than that of any other eVTOL competitor. A United Airlines partnership and a strategic investment from Boeing signal that the technology has cleared some serious commercial scrutiny, even if the FAA certification finish line is still ahead. For investors with a very long horizon and a high tolerance for risk, it is worth watching.

But Archer is still burning through cash every quarter with almost no revenue, and commercial scale is years away. Rocket Lab is my pick because it is already generating revenue, winning contracts, and building a business that keeps getting larger. If you're comfortable with early-stage volatility, Rocket Lab is a more tangible foundation than a company still waiting on regulatory approval.

Sara Appino has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends Boeing and Rocket Lab. The Motley Fool recommends Stellantis. The Motley Fool has a disclosure policy.