OFLX vs AAON vs LII vs CSGS

For growth investors, AAON, Inc.

(AAON) is the stronger pick with 20. 1% revenue growth year-over-year, versus -3. 3% for Omega Flex, Inc. (OFLX). Omega Flex, Inc. (OFLX) offers the better valuation at 20. 7x trailing P/E (16. 6x forward), making it the more compelling value choice. Analysts rate AAON, Inc. (AAON) a "Buy" — based on 5 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, Omega Flex, Inc.

(OFLX) is the cheapest at 20. 7x versus AAON, Inc. at 100. 2x. On forward P/E, CSG Systems International, Inc. is actually cheaper at 15. 9x — 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: Lennox International Inc. wins at 1. 13x versus AAON, Inc. 's 12. 01x — a reasonable growth-adjusted valuation.

Over the past 5 years, AAON, Inc.

(AAON) delivered a total return of +196. 3%, compared to -76. 2% for Omega Flex, Inc. (OFLX). Over 10 years, the gap is even starker: AAON returned +612. 1% versus OFLX's +39. 0%. 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), CSG Systems International, Inc.

(CSGS) is the lower-risk stock at 0. 44β versus AAON, Inc. 's 1. 83β — meaning AAON is approximately 314% more volatile than CSGS relative to the S&P 500. On balance sheet safety, Omega Flex, Inc. (OFLX) carries a lower debt/equity ratio of 6% versus 2% for CSG Systems International, Inc. — giving it more financial flexibility in a downturn.

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

(AAON) is pulling ahead at 20. 1% versus -3. 3% for Omega Flex, Inc. (OFLX). On earnings-per-share growth, the picture is similar: Lennox International Inc. grew EPS -1. 4% year-over-year, compared to -36. 1% for AAON, Inc.. Over a 3-year CAGR, AAON leads at 17. 5% 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.

Lennox International Inc.

(LII) is the more profitable company, earning 15. 1% net margin versus 4. 6% for CSG Systems International, Inc. — meaning it keeps 15. 1% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: CSGS leads at 24. 5% versus 10. 1% for AAON. At the gross margin level — before operating expenses — OFLX leads at 56. 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, Lennox International Inc. (LII) is the more undervalued stock at a PEG of 1. 13x versus AAON, Inc. 's 12. 01x. A PEG below 1. 5 suggests fair-to-attractive pricing relative to expected growth. On forward earnings alone, CSG Systems International, Inc. (CSGS) trades at 15. 9x forward P/E versus 65. 3x for AAON, Inc. — 49. 4x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for LII: 5. 0% to $553. 45.

All stocks in this comparison pay dividends.

Omega Flex, Inc. (OFLX) offers the highest yield at 4. 5%, versus 0. 3% for AAON, Inc. (AAON).

For long-horizon retirement investors, CSG Systems International, Inc.

(CSGS) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0. 44), 1. 6% yield, +114. 6% 10Y return). AAON, Inc. (AAON) carries a higher beta of 1. 83 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (CSGS: +114. 6%, AAON: +612. 1%), 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 (OFLX (Industrials) and AAON (Industrials) and LII (Industrials) and CSGS (Technology)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: OFLX is a small-cap income-oriented stock; AAON is a mid-cap high-growth stock; LII is a mid-cap quality compounder stock; CSGS is a small-cap quality compounder stock. OFLX, LII, CSGS pay a dividend while AAON does not, making them suitable for different income and tax situations. 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.