NBTX vs NVCR vs ARAY

For growth investors, NovoCure Limited (NVCR) is the stronger pick with 8.

3% revenue growth year-over-year, versus -132. 1% for Nanobiotix S. A. (NBTX). Analysts rate Nanobiotix S. A. (NBTX) a "Buy" — based on 2 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.

Over the past 5 years, Nanobiotix S.

A. (NBTX) delivered a total return of +182. 9%, compared to -93. 9% for Accuray Incorporated (ARAY). Over 10 years, the gap is even starker: NBTX returned +150. 9% versus ARAY's -94. 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), Nanobiotix S.

A. (NBTX) is the lower-risk stock at 1. 81β versus Accuray Incorporated's 2. 42β — meaning ARAY is approximately 33% more volatile than NBTX relative to the S&P 500. On balance sheet safety, NovoCure Limited (NVCR) carries a lower debt/equity ratio of 85% versus 2% for Accuray Incorporated — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), NovoCure Limited (NVCR) is pulling ahead at 8.

3% versus -132. 1% for Nanobiotix S. A. (NBTX). On earnings-per-share growth, the picture is similar: Accuray Incorporated grew EPS 90. 3% year-over-year, compared to -33. 3% for Nanobiotix S. A.. Over a 3-year CAGR, NVCR leads at 6. 8% 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.

Nanobiotix S.

A. (NBTX) is the more profitable company, earning 586. 9% net margin versus -20. 8% for NovoCure Limited — meaning it keeps 586. 9% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: NBTX leads at 589. 1% versus -23. 5% for NVCR. At the gross margin level — before operating expenses — NBTX leads at 100. 0%, 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.

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, Nanobiotix S.

A. (NBTX) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (+150. 9% 10Y return). Accuray Incorporated (ARAY) carries a higher beta of 2. 42 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (NBTX: +150. 9%, ARAY: -94. 5%), 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.

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.