BLLN vs TMO vs DHR vs A vs ILMN

For growth investors, BillionToOne, Inc.

(BLLN) is the stronger pick with 100. 0% revenue growth year-over-year, versus -0. 8% for Illumina, Inc. (ILMN). Thermo Fisher Scientific Inc. (TMO) offers the better valuation at 26. 5x trailing P/E (18. 9x forward), making it the more compelling value choice. Analysts rate BillionToOne, Inc. (BLLN) a "Buy" — based on 4 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. 5x versus BillionToOne, Inc. at 1587. 4x. On forward P/E, Thermo Fisher Scientific Inc. is actually cheaper at 18. 9x. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: Agilent Technologies, Inc. wins at 1. 46x versus Danaher Corporation's 35. 21x — a reasonable growth-adjusted valuation.

Over the past 5 years, Thermo Fisher Scientific Inc.

(TMO) delivered a total return of +1. 4%, compared to -63. 4% for Illumina, Inc. (ILMN). Over 10 years, the gap is even starker: DHR returned +222. 6% versus BLLN's -7. 2%. 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.

70β versus BillionToOne, Inc. 's 1. 91β — meaning BLLN is approximately 171% more volatile than DHR relative to the S&P 500. On balance sheet safety, BillionToOne, Inc. (BLLN) carries a lower debt/equity ratio of 23% versus 94% for Illumina, Inc. — giving it more financial flexibility in a downturn.

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

(BLLN) is pulling ahead at 100. 0% versus -0. 8% for Illumina, Inc. (ILMN). On earnings-per-share growth, the picture is similar: Illumina, Inc. grew EPS 170. 9% year-over-year, compared to -4. 7% for Danaher Corporation. Over a 3-year CAGR, A leads at 0. 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.

Illumina, Inc.

(ILMN) is the more profitable company, earning 19. 6% net margin versus 2. 4% for BillionToOne, Inc. — meaning it keeps 19. 6% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: A leads at 21. 3% versus 5. 3% for BLLN. At the gross margin level — before operating expenses — BLLN leads at 68. 3%, 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. 46x versus Danaher Corporation's 35. 21x. 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. 9x forward P/E versus 102. 7x for BillionToOne, Inc. — 83. 8x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for DHR: 28. 7% to $231. 80.

In this comparison, A (0.

8% yield), DHR (0. 7% yield), TMO (0. 4% yield) pay a dividend. BLLN, ILMN 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.

70), 0. 7% yield, +222. 6% 10Y return). BillionToOne, Inc. (BLLN) carries a higher beta of 1. 91 — 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: +222. 6%, BLLN: -7. 2%), 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 Healthcare sector, making this a peer-level intra-sector comparison — the same macro tailwinds and headwinds will affect both.

In terms of investment character: BLLN is a small-cap high-growth stock; TMO is a mid-cap quality compounder stock; DHR is a mid-cap quality compounder stock; A is a mid-cap quality compounder stock; ILMN is a mid-cap quality compounder stock. DHR, A pay a dividend while BLLN, TMO, ILMN 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.