NTCT vs RDWR vs FFIV vs QLYS

For growth investors, Qualys, Inc.

(QLYS) is the stronger pick with 10. 1% revenue growth year-over-year, versus -0. 8% for NetScout Systems, Inc. (NTCT). Qualys, Inc. (QLYS) offers the better valuation at 17. 5x trailing P/E (12. 9x forward), making it the more compelling value choice. Analysts rate NetScout Systems, Inc. (NTCT) a "Hold" — based on 21 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 Radware Ltd. at 63. 0x. On forward P/E, Qualys, Inc. is actually cheaper at 12. 9x. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: Qualys, Inc. wins at 0. 66x versus Radware Ltd. 's 1. 45x — a PEG below 1. 0 traditionally signals the market is underpricing earnings growth.

Over the past 5 years, F5, Inc.

(FFIV) delivered a total return of +87. 2%, compared to -3. 1% for Qualys, Inc. (QLYS). Over 10 years, the gap is even starker: QLYS returned +267. 2% versus NTCT's +66. 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), Qualys, Inc.

(QLYS) is the lower-risk stock at 0. 53β versus NetScout Systems, Inc. 's 1. 12β — meaning NTCT is approximately 112% more volatile than QLYS relative to the S&P 500. On balance sheet safety, Radware Ltd. (RDWR) carries a lower debt/equity ratio of 4% versus 17% for Qualys, Inc. — giving it more financial flexibility in a downturn.

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

(QLYS) is pulling ahead at 10. 1% versus -0. 8% for NetScout Systems, Inc. (NTCT). On earnings-per-share growth, the picture is similar: Radware Ltd. grew EPS 221. 4% year-over-year, compared to -144. 4% for NetScout Systems, Inc.. Over a 3-year CAGR, QLYS leads at 11. 0% 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 -44. 6% for NetScout Systems, 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 -44. 7% for NTCT. 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. 66x versus Radware Ltd. 's 1. 45x. A PEG below 1. 0 is traditionally considered the threshold for growth-adjusted undervaluation. On forward earnings alone, Qualys, Inc. (QLYS) trades at 12. 9x forward P/E versus 25. 5x for Radware Ltd. — 12. 7x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for QLYS: 41. 5% to $134. 30.

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, Qualys, Inc.

(QLYS) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0. 53), +267. 2% 10Y return). Both have compounded well over 10 years (QLYS: +267. 2%, NTCT: +66. 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 Technology sector, making this a peer-level intra-sector comparison — the same macro tailwinds and headwinds will affect both.

In terms of investment character: NTCT is a small-cap quality compounder stock; RDWR is a small-cap quality compounder stock; FFIV is a mid-cap quality compounder stock; QLYS is a small-cap deep-value 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.