AIR vs KAI vs HEI vs GTLS

For growth investors, AAR Corp.

(AIR) is the stronger pick with 19. 9% revenue growth year-over-year, versus -0. 1% for Kadant Inc. (KAI). Kadant Inc. (KAI) offers the better valuation at 39. 4x trailing P/E (37. 1x forward), making it the more compelling value choice. Analysts rate AAR Corp. (AIR) a "Buy" — based on 20 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, Kadant Inc.

(KAI) is the cheapest at 39. 4x versus Chart Industries, Inc. at 628. 5x. On forward P/E, Chart Industries, Inc. is actually cheaper at 16. 4x — notably different from the trailing picture, reflecting expected earnings growth. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: Kadant Inc. wins at 2. 93x versus HEICO Corporation's 3. 14x.

Over the past 5 years, AAR Corp.

(AIR) delivered a total return of +191. 8%, compared to +29. 5% for Chart Industries, Inc. (GTLS). Over 10 years, the gap is even starker: HEI returned +823. 0% versus AIR's +399. 6%. 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), Chart Industries, Inc.

(GTLS) is the lower-risk stock at 0. 56β versus AAR Corp. 's 1. 64β — meaning AIR is approximately 194% more volatile than GTLS relative to the S&P 500. On balance sheet safety, Kadant Inc. (KAI) carries a lower debt/equity ratio of 38% versus 111% for Chart Industries, Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), AAR Corp.

(AIR) is pulling ahead at 19. 9% versus -0. 1% for Kadant Inc. (KAI). On earnings-per-share growth, the picture is similar: HEICO Corporation grew EPS 33. 5% year-over-year, compared to -92. 0% for Chart Industries, Inc.. Over a 3-year CAGR, GTLS leads at 38. 3% 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.

HEICO Corporation (HEI) is the more profitable company, earning 15.

4% net margin versus 0. 4% for AAR Corp. — meaning it keeps 15. 4% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: HEI leads at 22. 7% versus 6. 7% for AIR. At the gross margin level — before operating expenses — KAI leads at 45. 2%, 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, Kadant Inc. (KAI) is the more undervalued stock at a PEG of 2. 93x versus HEICO Corporation's 3. 14x. Both stocks trade at elevated growth-adjusted valuations, so expected growth needs to materialise. On forward earnings alone, Chart Industries, Inc. (GTLS) trades at 16. 4x forward P/E versus 51. 6x for HEICO Corporation — 35. 2x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for HEI: 28. 1% to $371. 00.

In this comparison, KAI (0.

4% yield), GTLS (0. 3% yield) pay a dividend. AIR, HEI do not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, Chart Industries, Inc.

(GTLS) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0. 56), +772. 5% 10Y return). AAR Corp. (AIR) carries a higher beta of 1. 64 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (GTLS: +772. 5%, AIR: +399. 6%), 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 Industrials sector, making this a peer-level intra-sector comparison — the same macro tailwinds and headwinds will affect both.

In terms of investment character: AIR is a small-cap high-growth stock; KAI is a small-cap quality compounder stock; HEI is a mid-cap high-growth stock; GTLS 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.