INTZ vs PANW vs FTNT vs QLYS vs TENB

For growth investors, Intrusion Inc.

(INTZ) is the stronger pick with 22. 9% revenue growth year-over-year, versus 10. 1% for Qualys, Inc. (QLYS). Qualys, Inc. (QLYS) offers the better valuation at 17. 5x trailing P/E (12. 4x forward), making it the more compelling value choice. Analysts rate Palo Alto Networks, Inc. (PANW) a "Buy" — based on 86 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, Qualys, Inc.

(QLYS) is the cheapest at 17. 5x versus Palo Alto Networks, Inc. at 122. 8x. On forward P/E, Tenable Holdings, Inc. is actually cheaper at 11. 1x — 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: Qualys, Inc. wins at 0. 64x versus Fortinet, Inc. 's 1. 10x — a PEG below 1. 0 traditionally signals the market is underpricing earnings growth.

Over the past 5 years, Palo Alto Networks, Inc.

(PANW) delivered a total return of +244. 4%, compared to -99. 6% for Intrusion Inc. (INTZ). Over 10 years, the gap is even starker: FTNT returned +1680% versus INTZ's -88. 7%. 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), Qualys, Inc.

(QLYS) is the lower-risk stock at 0. 46β versus Intrusion Inc. 's 2. 40β — meaning INTZ is approximately 422% more volatile than QLYS relative to the S&P 500. On balance sheet safety, Palo Alto Networks, Inc. (PANW) carries a lower debt/equity ratio of 4% versus 143% for Tenable Holdings, Inc. — giving it more financial flexibility in a downturn.

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

(INTZ) is pulling ahead at 22. 9% versus 10. 1% for Qualys, Inc. (QLYS). On earnings-per-share growth, the picture is similar: Intrusion Inc. grew EPS 68. 9% year-over-year, compared to -56. 0% for Palo Alto Networks, Inc.. Over a 3-year CAGR, PANW leads at 18. 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.

Qualys, Inc.

(QLYS) is the more profitable company, earning 29. 6% net margin versus -127. 7% for Intrusion Inc. — meaning it keeps 29. 6% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: QLYS leads at 33. 2% versus -129. 2% for INTZ. At the gross margin level — before operating expenses — QLYS leads at 82. 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.

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, Qualys, Inc. (QLYS) is the more undervalued stock at a PEG of 0. 64x versus Fortinet, Inc. 's 1. 10x. A PEG below 1. 0 is traditionally considered the threshold for growth-adjusted undervaluation. On forward earnings alone, Tenable Holdings, Inc. (TENB) trades at 11. 1x forward P/E versus 56. 4x for Palo Alto Networks, Inc. — 45. 3x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for TENB: 29. 7% to $27. 94.

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, Fortinet, Inc.

(FTNT) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 1. 01), +1680% 10Y return). Intrusion Inc. (INTZ) carries a higher beta of 2. 40 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (FTNT: +1680%, INTZ: -88. 7%), 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: INTZ is a small-cap high-growth stock; PANW is a mid-cap quality compounder stock; FTNT is a mid-cap quality compounder stock; QLYS is a small-cap deep-value stock; TENB 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.