MIR vs WAT vs A vs OSIS vs TMO

For growth investors, OSI Systems, Inc.

(OSIS) is the stronger pick with 11. 3% revenue growth year-over-year, versus 3. 9% for Thermo Fisher Scientific Inc. (TMO). Agilent Technologies, Inc. (A) offers the better valuation at 26. 0x trailing P/E (19. 4x forward), making it the more compelling value choice. Analysts rate Mirion Technologies, Inc. (MIR) a "Buy" — based on 9 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, Agilent Technologies, Inc.

(A) is the cheapest at 26. 0x versus Mirion Technologies, Inc. at 179. 5x. On forward P/E, Thermo Fisher Scientific Inc. is actually cheaper at 18. 7x — notably different from the trailing picture, reflecting expected earnings growth. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: Agilent Technologies, Inc. wins at 1. 32x versus Thermo Fisher Scientific Inc. 's 8. 86x — a reasonable growth-adjusted valuation.

Over the past 5 years, OSI Systems, Inc.

(OSIS) delivered a total return of +149. 9%, compared to -8. 0% for Agilent Technologies, Inc. (A). Over 10 years, the gap is even starker: OSIS returned +352. 2% versus MIR's +90. 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), Thermo Fisher Scientific Inc.

(TMO) is the lower-risk stock at 1. 07β versus Mirion Technologies, Inc. 's 1. 95β — meaning MIR is approximately 81% more volatile than TMO relative to the S&P 500. On balance sheet safety, Agilent Technologies, Inc. (A) carries a lower debt/equity ratio of 50% versus 76% for Thermo Fisher Scientific Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), OSI Systems, Inc.

(OSIS) is pulling ahead at 11. 3% versus 3. 9% for Thermo Fisher Scientific Inc. (TMO). On earnings-per-share growth, the picture is similar: Mirion Technologies, Inc. grew EPS 161. 1% year-over-year, compared to 0. 5% for Waters Corporation. Over a 3-year CAGR, OSIS leads at 13. 1% 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.

Waters Corporation (WAT) is the more profitable company, earning 20.

3% net margin versus 3. 1% for Mirion Technologies, Inc. — meaning it keeps 20. 3% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: WAT leads at 28. 2% versus 5. 6% for MIR. At the gross margin level — before operating expenses — WAT leads at 57. 8%, 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, Agilent Technologies, Inc. (A) is the more undervalued stock at a PEG of 1. 32x versus Thermo Fisher Scientific Inc. 's 8. 86x. A PEG below 1. 5 suggests fair-to-attractive pricing relative to expected growth. On forward earnings alone, Thermo Fisher Scientific Inc. (TMO) trades at 18. 7x forward P/E versus 34. 9x for Mirion Technologies, Inc. — 16. 2x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for MIR: 43. 0% to $28. 25.

In this comparison, A (0.

8% yield), TMO (0. 4% yield) pay a dividend. MIR, WAT, OSIS do not pay a meaningful dividend and should not be held primarily for income.

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

(A) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 1. 21), 0. 8% yield, +198. 4% 10Y return). Mirion Technologies, Inc. (MIR) carries a higher beta of 1. 95 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (A: +198. 4%, MIR: +90. 9%), 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.

These companies operate in different sectors (MIR (Industrials) and WAT (Healthcare) and A (Healthcare) and OSIS (Technology) and TMO (Healthcare)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

A pays a dividend while MIR, WAT, OSIS, TMO do not, making them suitable for different income and tax situations. 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.