Better Artificial Intelligence Stock: ASML vs. TSMC

ASML and Taiwan Semiconductor (TSMC) are the dominant pillars of AI infrastructure — ASML controls roughly 90% of the lithography market and derives growing, high-margin recurring service revenue (service revenue +39% to €6bn in the first nine months of 2025; revenue +21% to €23bn; diluted EPS +40% to $17.38), while TSMC likewise commands about 90% of advanced AI processor manufacturing (Q3 sales doubled to $33bn; earnings +39% to $2.92 per ADR) and benefits from deep R&D advantages Morningstar says could persist for years. Both stand to gain from massive AI-capex tailwinds (Nvidia cites up to $4tn in infrastructure spending over five years), but the author prefers TSMC on valuation grounds — P/E ~26 versus ASML’s ~36 and the tech sector average ~47 — making TSMC the slightly cheaper way to play secular AI demand, though owning both is presented as a solid long-term strategy.

Analysis

ASML remains the dominant lithography supplier with roughly 90% market share and technology rivals reported to be at least a decade behind; the company reported service revenue up 39% to €6 billion in the first nine months of 2025, overall revenue +21% to €23 billion, diluted EPS up 40% to $17.38, and gross margins in the low-50% range, highlighting a high-margin, recurring-revenue profile tied to long-lived equipment. Taiwan Semiconductor Manufacturing (TSMC) similarly commands an estimated 90% share of advanced AI processor manufacturing, with third-quarter sales doubling to $33 billion and earnings rising 39% to $2.92 per ADR, supported by sustained R&D investment and Morningstar's view that its advantages could persist up to two decades. Valuation materially separates the two names: TSMC trades at a P/E near 26 versus ASML at about 36 and the tech-sector average near 47, which is the primary rationale the author cites for favoring TSMC. Both companies are positioned to benefit from large AI-capex tailwinds — Nvidia management has cited up to $4 trillion in infrastructure spend over five years — but investors should weigh valuation differentials, concentration risks in semiconductor supply chains, and the source disclosure that the publisher holds positions in these names when sizing exposure.

Key Decisions for Investors

• Consider allocating incremental exposure to TSMC rather than ASML on valuation grounds given TSMC's P/E ~26 versus ASML ~36 while retaining the leverage to AI demand, Monitor ASML for continued service-revenue growth and margin stability as a reason to hold or selectively add exposure due to its durable lithography monopoly, Track AI-capex indicators (customer capex announcements, Nvidia-led infrastructure commitments) and quarterly sales/earnings trajectory for both companies and be prepared to rebalance if growth or margins disappoint or if valuations re-rate