SOTK vs MKSI vs ENTG vs ONTO vs UCTT

For growth investors, MKS Inc.

(MKSI) is the stronger pick with 9. 6% revenue growth year-over-year, versus -2. 1% for Ultra Clean Holdings, Inc. (UCTT). Sono-Tek Corporation (SOTK) offers the better valuation at 59. 7x trailing P/E, making it the more compelling value choice. Analysts rate MKS Inc. (MKSI) a "Buy" — based on 29 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, Sono-Tek Corporation (SOTK) is the cheapest at 59.

7x versus Onto Innovation Inc. at 102. 4x. On forward P/E, MKS Inc. is actually cheaper at 27. 3x — notably different from the trailing picture, reflecting expected earnings growth.

Over the past 5 years, Onto Innovation Inc.

(ONTO) delivered a total return of +360. 4%, compared to +16. 4% for Sono-Tek Corporation (SOTK). Over 10 years, the gap is even starker: UCTT returned +1519% versus SOTK's +382. 0%. 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), Sono-Tek Corporation (SOTK) is the lower-risk stock at 0.

48β versus Ultra Clean Holdings, Inc. 's 3. 21β — meaning UCTT is approximately 564% more volatile than SOTK relative to the S&P 500. On balance sheet safety, Onto Innovation Inc. (ONTO) carries a lower debt/equity ratio of 1% versus 173% for MKS Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), MKS Inc.

(MKSI) is pulling ahead at 9. 6% versus -2. 1% for Ultra Clean Holdings, Inc. (UCTT). On earnings-per-share growth, the picture is similar: MKS Inc. grew EPS 55. 5% year-over-year, compared to -869. 2% for Ultra Clean Holdings, Inc.. Over a 3-year CAGR, SOTK leads at 6. 2% 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.

Onto Innovation Inc.

(ONTO) is the more profitable company, earning 13. 6% net margin versus -8. 8% for Ultra Clean Holdings, Inc. — meaning it keeps 13. 6% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: ENTG leads at 28. 9% versus 2. 1% for UCTT. At the gross margin level — before operating expenses — ONTO leads at 49. 7%, 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.

On forward earnings alone, MKS Inc.

(MKSI) trades at 27. 3x forward P/E versus 41. 0x for Entegris, Inc. — 13. 8x 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, MKSI (0.

3% yield), ENTG (0. 3% yield) pay a dividend. SOTK, ONTO, UCTT do not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, Sono-Tek Corporation (SOTK) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0.

48), +382. 0% 10Y return). MKS Inc. (MKSI) carries a higher beta of 2. 56 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (SOTK: +382. 0%, MKSI: +784. 8%), 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.

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.