AVTR vs TMO vs DHR vs MLAB vs SITE

For growth investors, Mesa Laboratories, Inc.

(MLAB) is the stronger pick with 11. 5% revenue growth year-over-year, versus -3. 4% for Avantor, Inc. (AVTR). Thermo Fisher Scientific Inc. (TMO) offers the better valuation at 26. 8x trailing P/E (19. 1x forward), making it the more compelling value choice. Analysts rate Thermo Fisher Scientific Inc. (TMO) a "Buy" — based on 42 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, Thermo Fisher Scientific Inc.

(TMO) is the cheapest at 26. 8x versus SiteOne Landscape Supply, Inc. at 37. 1x. On forward P/E, Avantor, Inc. is actually cheaper at 10. 6x — 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: SiteOne Landscape Supply, Inc. wins at 6. 91x versus Danaher Corporation's 34. 35x.

Over the past 5 years, Thermo Fisher Scientific Inc.

(TMO) delivered a total return of +2. 8%, compared to -73. 4% for Avantor, Inc. (AVTR). Over 10 years, the gap is even starker: SITE returned +368. 6% versus AVTR's -42. 7%. 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), Danaher Corporation (DHR) is the lower-risk stock at 0.

94β versus Mesa Laboratories, Inc. 's 1. 78β — meaning MLAB is approximately 90% more volatile than DHR relative to the S&P 500. On balance sheet safety, Danaher Corporation (DHR) carries a lower debt/equity ratio of 35% versus 114% for Mesa Laboratories, Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Mesa Laboratories, Inc.

(MLAB) is pulling ahead at 11. 5% versus -3. 4% for Avantor, Inc. (AVTR). On earnings-per-share growth, the picture is similar: Mesa Laboratories, Inc. grew EPS 99. 2% year-over-year, compared to -175. 0% for Avantor, Inc.. Over a 3-year CAGR, MLAB leads at 9. 3% 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.

Thermo Fisher Scientific Inc.

(TMO) is the more profitable company, earning 15. 1% net margin versus -8. 1% for Avantor, Inc. — meaning it keeps 15. 1% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: DHR leads at 20. 9% versus -3. 8% for AVTR. At the gross margin level — before operating expenses — MLAB leads at 62. 6%, 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, SiteOne Landscape Supply, Inc. (SITE) is the more undervalued stock at a PEG of 6. 91x versus Danaher Corporation's 34. 35x. Both stocks trade at elevated growth-adjusted valuations, so expected growth needs to materialise. On forward earnings alone, Avantor, Inc. (AVTR) trades at 10. 6x forward P/E versus 28. 7x for SiteOne Landscape Supply, Inc. — 18. 1x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for DHR: 40. 6% to $247. 00.

In this comparison, DHR (0.

7% yield), MLAB (0. 6% yield), TMO (0. 4% yield) pay a dividend. AVTR, SITE do not pay a meaningful dividend and should not be held primarily for income.

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

94), 0. 7% yield, +219. 3% 10Y return). Avantor, Inc. (AVTR) carries a higher beta of 1. 54 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (DHR: +219. 3%, AVTR: -42. 7%), 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 (AVTR (Healthcare) and TMO (Healthcare) and DHR (Healthcare) and MLAB (Technology) and SITE (Industrials)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

DHR, MLAB pay a dividend while AVTR, TMO, SITE 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.