QBTS vs IONQ vs RGTI vs QUBT

For growth investors, IonQ, Inc.

(IONQ) is the stronger pick with 201. 9% revenue growth year-over-year, versus -34. 3% for Rigetti Computing, Inc. (RGTI). Analysts rate D-Wave Quantum Inc. (QBTS) a "Buy" — based on 13 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, IonQ, Inc.

(IONQ) delivered a total return of +367. 1%, compared to +85. 3% for Rigetti Computing, Inc. (RGTI). Over 10 years, the gap is even starker: QUBT returned +9629% versus RGTI's +85. 3%. 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), IonQ, Inc.

(IONQ) is the lower-risk stock at 2. 91β versus Quantum Computing, Inc. 's 3. 54β — meaning QUBT is approximately 22% more volatile than IONQ relative to the S&P 500. On balance sheet safety, Quantum Computing, Inc. (QUBT) carries a lower debt/equity ratio of 0% versus 1% for Rigetti Computing, Inc. — giving it more financial flexibility in a downturn.

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

(IONQ) is pulling ahead at 201. 9% versus -34. 3% for Rigetti Computing, Inc. (RGTI). On earnings-per-share growth, the picture is similar: Quantum Computing, Inc. grew EPS 84. 9% year-over-year, compared to -48. 0% for D-Wave Quantum Inc.. Over a 3-year CAGR, IONQ leads at 126. 9% 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.

IonQ, Inc.

(IONQ) is the more profitable company, earning -392. 6% net margin versus -30. 5% for Rigetti Computing, Inc. — meaning it keeps -392. 6% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: QBTS leads at -408. 2% versus -74. 9% for QUBT. At the gross margin level — before operating expenses — QBTS leads at 82. 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.

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, Quantum Computing, Inc.

(QUBT) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (+9629% 10Y return). Rigetti Computing, Inc. (RGTI) carries a higher beta of 3. 39 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (QUBT: +9629%, RGTI: +85. 3%), 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 Technology sector, making this a peer-level intra-sector comparison — the same macro tailwinds and headwinds will affect both.

In terms of investment character: QBTS is a small-cap high-growth stock; IONQ is a mid-cap high-growth stock; RGTI is a small-cap quality compounder stock; QUBT is a small-cap high-growth 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.