ADT vs ALLE vs NSSC vs CSGP vs REZI

For growth investors, CoStar Group, Inc.

(CSGP) is the stronger pick with 18. 7% revenue growth year-over-year, versus -3. 8% for Napco Security Technologies, Inc. (NSSC). ADT Inc. (ADT) offers the better valuation at 10. 3x trailing P/E (7. 5x forward), making it the more compelling value choice. Analysts rate ADT Inc. (ADT) a "Buy" — based on 17 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, ADT Inc.

(ADT) is the cheapest at 10. 3x versus CoStar Group, Inc. at 2107. 2x. On forward P/E, ADT Inc. is actually cheaper at 7. 5x. The PEG ratio (P/E divided by earnings growth rate) is the most growth-adjusted single valuation metric: Napco Security Technologies, Inc. wins at 0. 74x versus Allegion plc's 0. 92x — a PEG below 1. 0 traditionally signals the market is underpricing earnings growth.

Over the past 5 years, Napco Security Technologies, Inc.

(NSSC) delivered a total return of +151. 6%, compared to -58. 9% for CoStar Group, Inc. (CSGP). Over 10 years, the gap is even starker: NSSC returned +1366% versus ADT's -28. 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), Allegion plc (ALLE) is the lower-risk stock at 0.

67β versus Resideo Technologies, Inc. 's 2. 27β — meaning REZI is approximately 242% more volatile than ALLE relative to the S&P 500. On balance sheet safety, Napco Security Technologies, Inc. (NSSC) carries a lower debt/equity ratio of 3% versus 2% for ADT Inc. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), CoStar Group, Inc.

(CSGP) is pulling ahead at 18. 7% versus -3. 8% for Napco Security Technologies, Inc. (NSSC). On earnings-per-share growth, the picture is similar: ADT Inc. grew EPS 28. 8% year-over-year, compared to -718. 0% for Resideo Technologies, Inc.. Over a 3-year CAGR, CSGP leads at 14. 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.

Napco Security Technologies, Inc.

(NSSC) is the more profitable company, earning 23. 9% net margin versus -7. 1% for Resideo Technologies, Inc. — meaning it keeps 23. 9% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: ADT leads at 26. 0% versus -2. 2% for CSGP. At the gross margin level — before operating expenses — CSGP leads at 75. 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, Napco Security Technologies, Inc. (NSSC) is the more undervalued stock at a PEG of 0. 74x versus Allegion plc's 0. 92x. A PEG below 1. 0 is traditionally considered the threshold for growth-adjusted undervaluation. On forward earnings alone, ADT Inc. (ADT) trades at 7. 5x forward P/E versus 29. 0x for Napco Security Technologies, Inc. — 21. 4x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for CSGP: 77. 0% to $61. 91.

In this comparison, ADT (3.

0% yield), ALLE (1. 5% yield), NSSC (0. 9% yield), REZI (0. 6% yield) pay a dividend. CSGP does not pay a meaningful dividend and should not be held primarily for income.

For long-horizon retirement investors, Napco Security Technologies, Inc.

(NSSC) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 1. 25), 0. 9% yield, +1366% 10Y return). Resideo Technologies, Inc. (REZI) carries a higher beta of 2. 27 — meaning larger drawdowns in market downturns, which matters significantly when you cannot wait years for a recovery. Both have compounded well over 10 years (NSSC: +1366%, REZI: +38. 9%), 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 (ADT (Industrials) and ALLE (Industrials) and NSSC (Industrials) and CSGP (Real Estate) and REZI (Industrials)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: ADT is a small-cap deep-value stock; ALLE is a mid-cap quality compounder stock; NSSC is a small-cap quality compounder stock; CSGP is a mid-cap high-growth stock; REZI is a small-cap quality compounder stock. ADT, ALLE, NSSC, REZI pay a dividend while CSGP 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.