BLLN vs CDNA

For growth investors, BillionToOne, Inc.

(BLLN) is the stronger pick with 100. 0% revenue growth year-over-year, versus 13. 8% for CareDx, Inc (CDNA). BillionToOne, Inc. (BLLN) offers the better valuation at 1587. 4x trailing P/E (102. 7x 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 forward P/E, CareDx, Inc is actually cheaper at 24.

6x — notably different from the trailing picture, reflecting expected earnings growth.

Over the past 5 years, BillionToOne, Inc.

(BLLN) delivered a total return of -7. 2%, compared to -74. 6% for CareDx, Inc (CDNA). Over 10 years, the gap is even starker: CDNA returned +388. 7% 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), CareDx, Inc (CDNA) is the lower-risk stock at 1.

17β versus BillionToOne, Inc. 's 1. 91β — meaning BLLN is approximately 63% more volatile than CDNA relative to the S&P 500. On balance sheet safety, CareDx, Inc (CDNA) carries a lower debt/equity ratio of 6% versus 23% for BillionToOne, 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 13. 8% for CareDx, Inc (CDNA). On earnings-per-share growth, the picture is similar: BillionToOne, Inc. grew EPS 106. 8% year-over-year, compared to -143. 0% for CareDx, Inc. 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.

BillionToOne, Inc.

(BLLN) is the more profitable company, earning 2. 4% net margin versus -5. 6% for CareDx, Inc — meaning it keeps 2. 4% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: BLLN leads at 5. 3% versus -5. 5% for CDNA. 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.

On forward earnings alone, CareDx, Inc (CDNA) trades at 24.

6x forward P/E versus 102. 7x for BillionToOne, Inc. — 78. 1x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for BLLN: 23. 6% to $125. 00.

None of the stocks in this comparison currently pay a material dividend.

All are effectively zero-yield and should be held for capital appreciation rather than income.

For long-horizon retirement investors, CareDx, Inc (CDNA) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 1.

17), +388. 7% 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 (CDNA: +388. 7%, 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; CDNA is a small-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.