KEYS vs COHR vs VIAV vs MKSI vs FORM

For growth investors, Coherent, Inc.

(COHR) is the stronger pick with 23. 4% revenue growth year-over-year, versus 2. 8% for FormFactor, Inc. (FORM). MKS Inc. (MKSI) offers the better valuation at 68. 8x trailing P/E (30. 4x forward), making it the more compelling value choice. Analysts rate Keysight Technologies, Inc. (KEYS) a "Buy" — based on 15 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, MKS Inc.

(MKSI) is the cheapest at 68. 8x versus Viavi Solutions Inc. at 340. 3x. On forward P/E, MKS Inc. is actually cheaper at 30. 4x. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: Keysight Technologies, Inc. wins at 4. 97x versus Viavi Solutions Inc. 's 12. 09x.

Over the past 5 years, Coherent, Inc.

(COHR) delivered a total return of +401. 6%, compared to +66. 5% for MKS Inc. (MKSI). Over 10 years, the gap is even starker: FORM returned +1952% versus VIAV's +715. 5%. 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), Viavi Solutions Inc.

(VIAV) is the lower-risk stock at 1. 54β versus Coherent, Inc. 's 2. 79β — meaning COHR is approximately 81% more volatile than VIAV relative to the S&P 500. On balance sheet safety, FormFactor, Inc. (FORM) carries a lower debt/equity ratio of 4% versus 173% for MKS Inc. — giving it more financial flexibility in a downturn.

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

(COHR) is pulling ahead at 23. 4% versus 2. 8% for FormFactor, Inc. (FORM). On earnings-per-share growth, the picture is similar: Viavi Solutions Inc. grew EPS 225. 0% year-over-year, compared to -22. 5% for FormFactor, Inc.. Over a 3-year CAGR, COHR leads at 20. 5% 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.

Keysight Technologies, Inc.

(KEYS) is the more profitable company, earning 15. 7% net margin versus 0. 8% for Coherent, Inc. — meaning it keeps 15. 7% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: KEYS leads at 17. 6% versus 6. 5% for VIAV. At the gross margin level — before operating expenses — KEYS leads at 62. 1%, 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, Keysight Technologies, Inc. (KEYS) is the more undervalued stock at a PEG of 4. 97x versus Viavi Solutions Inc. 's 12. 09x. Both stocks trade at elevated growth-adjusted valuations, so expected growth needs to materialise. On forward earnings alone, MKS Inc. (MKSI) trades at 30. 4x forward P/E versus 66. 5x for FormFactor, Inc. — 36. 1x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for MKSI: -9. 3% to $272. 86.

In this comparison, MKSI (0.

3% yield) pays a dividend. KEYS, COHR, VIAV, FORM do not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, Keysight Technologies, Inc.

(KEYS) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (+1279% 10Y return). MKS Inc. (MKSI) carries a higher beta of 2. 64 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (KEYS: +1279%, MKSI: +750. 6%), 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: KEYS is a mid-cap quality compounder stock; COHR is a mid-cap high-growth stock; VIAV is a mid-cap quality compounder stock; MKSI is a mid-cap quality compounder stock; FORM 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.