RTX vs TDG: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of September 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.

The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. RTX and TDG share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.

This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined RTX and TDG exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.

RTX Corporation (RTX), formerly Raytheon Technologies, is one of the world's largest aerospace and defense companies. It operates three businesses. Collins Aerospace supplies avionics, interiors, actuation, and other systems for commercial and military aircraft. Pratt & Whitney designs and manufactures jet engines for airliners (including the geared turbofan) and military aircraft, and earns substantial recurring revenue from servicing its large installed engine base. Raytheon, the defense segment, builds missiles, missile defense systems (including Patriot), radars, and other advanced defense electronics for the US military and allied governments.

Full RTX guide

TransDigm Group designs and manufactures highly engineered aerospace components used on commercial and military aircraft. Its business model is distinctive: it focuses on proprietary, sole-source parts (things like pumps, valves, actuators, ignition systems, cockpit controls, and specialized fasteners) where TransDigm is often the only approved supplier for a given aircraft. A large share of revenue comes from the aftermarket, selling replacement parts and spares over the decades-long service life of an aircraft, which carries very high margins and recurring demand. TransDigm grows through a disciplined acquisition strategy, buying niche aerospace-parts makers with similar proprietary, sole-source characteristics and then applying its playbook of value-based pricing and cost discipline. The company is known for a private-equity-style approach to capital allocation, high leverage, and large special dividends. Headquartered in Cleveland, Ohio, it serves commercial airlines, business jets, and defense customers worldwide.

Full TDG guide

Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.

• RTX drivers: Commercial aftermarket; Defense backlog and missiles.
• TDG drivers: High-margin proprietary aftermarket; Acquisition-driven growth.

A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: RTX faces program-execution risks, most visibly the Pratt & Whitney geared-turbofan powder-metal inspection issue that forced costly engine removals and weighed on cash. For TDG, transDigm carries very high debt, a deliberate part of its model, which raises interest costs and financial risk if cash flow weakens or rates stay elevated.

Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick RTX if you believe its drivers more; TDG if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the RTX and TDG guides.

RTX. RTX trades as a large, dividend-paying aerospace and defense blue chip valued on its huge backlog, recurring aftermarket revenue, and dual commercial-defense exposure rather than rapid growth. Its multiple reflects steady, cash-generative franchises balanced against program-execution risk like the geared-turbofan issue, with the dividend and backlog supporting the shares.

TDG. TransDigm trades at a premium valuation justified by best-in-class margins, a wide sole-source moat, and a long record of compounding through acquisitions. The qualitative profile is a high-quality, highly levered aerospace compounder. The premium multiple and high leverage mean the stock is sensitive to air-traffic cycles, acquisition pace, and any erosion of pricing power.

Headline figures (approximate, early 2026): RTX shows revenue (ttm) ~$80 billion, operating margin ~10-12%, backlog Very large (over $200 billion, commercial plus defense), net income (ttm) Several billion dollars; TDG shows revenue (ttm) ~$8 to 9 billion, ebitda margin ~50%, among the highest in aerospace, aftermarket revenue share roughly half of total revenue, net leverage high, by design (around 5x EBITDA).

RTX and TDG are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined RTX and TDG exposure against your real portfolio. It is not an investment adviser.