WPRT vs PESI vs CLNE vs HYLN vs PLUG

For growth investors, Hyliion Holdings Corp.

(HYLN) is the stronger pick with 130. 3% revenue growth year-over-year, versus -8. 9% for Westport Fuel Systems Inc. (WPRT). Analysts rate Clean Energy Fuels Corp. (CLNE) a "Buy" — based on 22 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, Perma-Fix Environmental Services, Inc.

(PESI) delivered a total return of +45. 6%, compared to -96. 9% for Westport Fuel Systems Inc. (WPRT). Over 10 years, the gap is even starker: PESI returned +178. 6% versus WPRT's -91. 9%. 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), Westport Fuel Systems Inc.

(WPRT) is the lower-risk stock at 0. 88β versus Plug Power Inc. 's 2. 57β — meaning PLUG is approximately 191% more volatile than WPRT relative to the S&P 500. On balance sheet safety, Hyliion Holdings Corp. (HYLN) carries a lower debt/equity ratio of 2% versus 20% for Plug Power Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Hyliion Holdings Corp.

(HYLN) is pulling ahead at 130. 3% versus -8. 9% for Westport Fuel Systems Inc. (WPRT). On earnings-per-share growth, the picture is similar: Plug Power Inc. grew EPS 100. 0% year-over-year, compared to -173. 0% for Clean Energy Fuels Corp.. Over a 3-year CAGR, HYLN leads at 18. 2% 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.

Westport Fuel Systems Inc.

(WPRT) is the more profitable company, earning -7. 2% net margin versus -1645. 7% for Hyliion Holdings Corp. — meaning it keeps -7. 2% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: PLUG leads at 38. 1% versus -1886. 4% for HYLN. At the gross margin level — before operating expenses — PLUG leads at 99. 8%, 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, Westport Fuel Systems Inc.

(WPRT) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0. 88)). Hyliion Holdings Corp. (HYLN) carries a higher beta of 2. 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 (WPRT: -91. 9%, HYLN: -74. 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.

These companies operate in different sectors (WPRT (Consumer Cyclical) and PESI (Industrials) and CLNE (Energy) and HYLN (Consumer Cyclical) and PLUG (Industrials)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: WPRT is a small-cap quality compounder stock; PESI is a small-cap quality compounder stock; CLNE is a small-cap quality compounder stock; HYLN is a small-cap high-growth stock; PLUG 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.