PDFS vs KLAC vs AMAT vs ONTO

For growth investors, KLA Corporation (KLAC) is the stronger pick with 23.

9% revenue growth year-over-year, versus 1. 8% for Onto Innovation Inc. (ONTO). Applied Materials, Inc. (AMAT) offers the better valuation at 50. 3x trailing P/E (39. 3x forward), making it the more compelling value choice. Analysts rate PDF Solutions, Inc. (PDFS) a "Buy" — based on 5 analyst ratings — the highest consensus in this comparison. The "better buy" depends entirely on your goals: growth investors should weight revenue trajectory, value investors should weight P/E and PEG, and income investors should weight dividend yield and streak.

On trailing P/E, Applied Materials, Inc.

(AMAT) is the cheapest at 50. 3x versus Onto Innovation Inc. at 102. 4x. On forward P/E, Applied Materials, Inc. is actually cheaper at 39. 3x. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: Onto Innovation Inc. wins at 1. 16x versus Applied Materials, Inc. 's 2. 29x — a reasonable growth-adjusted valuation.

Over the past 5 years, KLA Corporation (KLAC) delivered a total return of +532.

7%, compared to +184. 5% for PDF Solutions, Inc. (PDFS). Over 10 years, the gap is even starker: KLAC returned +26. 7% versus PDFS's +299. 9%. Past returns do not guarantee future results, and the stock with the higher historical return may already have its best growth priced in.

By beta (market sensitivity over 5 years), Applied Materials, Inc.

(AMAT) is the lower-risk stock at 2. 19β versus Onto Innovation Inc. 's 2. 60β — meaning ONTO is approximately 18% more volatile than AMAT relative to the S&P 500. On balance sheet safety, Onto Innovation Inc. (ONTO) carries a lower debt/equity ratio of 1% versus 130% for KLA Corporation — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), KLA Corporation (KLAC) is pulling ahead at 23.

9% versus 1. 8% for Onto Innovation Inc. (ONTO). On earnings-per-share growth, the picture is similar: KLA Corporation grew EPS 49. 8% year-over-year, compared to -116. 3% for PDF Solutions, Inc.. Over a 3-year CAGR, PDFS leads at 13. 8% annualised revenue growth. Higher growth typically commands a higher valuation multiple — check whether the premium P/E or P/S is justified by the growth rate using the PEG ratio.

KLA Corporation (KLAC) is the more profitable company, earning 33.

4% net margin versus -0. 3% for PDF Solutions, Inc. — meaning it keeps 33. 4% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: KLAC leads at 43. 1% versus 2. 7% for PDFS. At the gross margin level — before operating expenses — PDFS leads at 74. 0%, reflecting greater pricing power or product mix advantage. Stronger margins indicate durable pricing power, lower cost of revenue, or higher mix of software/services. They are one of the clearest signs of business quality.

The PEG ratio (forward P/E divided by expected earnings growth rate) is the most precise measure of undervaluation relative to growth potential.

By this metric, Onto Innovation Inc. (ONTO) is the more undervalued stock at a PEG of 1. 16x versus Applied Materials, Inc. 's 2. 29x. A PEG below 1. 5 suggests fair-to-attractive pricing relative to expected growth. On forward earnings alone, Applied Materials, Inc. (AMAT) trades at 39. 3x forward P/E versus 50. 5x for KLA Corporation — 11. 2x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for ONTO: 16. 5% to $331. 67.

In this comparison, AMAT (0.

4% yield), KLAC (0. 4% yield) pay a dividend. PDFS, ONTO do not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, Onto Innovation Inc.

(ONTO) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (+1491% 10Y return). Applied Materials, Inc. (AMAT) carries a higher beta of 2. 19 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (ONTO: +1491%, AMAT: +21. 4%), confirming both are viable long-term holds — but the lower-volatility option typically results in less emotional selling during corrections. Retirement portfolios generally favour predictability over maximum returns. Consult a financial advisor before making allocation decisions.

Both stocks operate in the Technology sector, making this a peer-level intra-sector comparison — the same macro tailwinds and headwinds will affect both.

In terms of investment character: PDFS is a small-cap high-growth stock; KLAC is a large-cap high-growth stock; AMAT is a large-cap quality compounder stock; ONTO is a mid-cap quality compounder stock. These fundamental differences mean investors should not choose between them on a single metric — the "better stock" depends entirely on which of these characteristics aligns with your investment strategy.