BBSI vs MMC vs AON vs WTW

For growth investors, Aon plc (AON) is the stronger pick with 9.

4% revenue growth year-over-year, versus -2. 2% for Willis Towers Watson Public Limited Company (WTW). Barrett Business Services, Inc. (BBSI) offers the better valuation at 14. 3x trailing P/E (17. 1x forward), making it the more compelling value choice. Analysts rate Barrett Business Services, Inc. (BBSI) 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, Barrett Business Services, Inc.

(BBSI) is the cheapest at 14. 3x versus Marsh & McLennan Companies, Inc. at 21. 3x. On forward P/E, Willis Towers Watson Public Limited Company is actually cheaper at 13. 2x — 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: Willis Towers Watson Public Limited Company wins at 0. 81x versus Barrett Business Services, Inc. 's 1. 25x — a PEG below 1. 0 traditionally signals the market is underpricing earnings growth.

Over the past 5 years, Barrett Business Services, Inc.

(BBSI) delivered a total return of +60. 4%, compared to +1. 9% for Willis Towers Watson Public Limited Company (WTW). Over 10 years, the gap is even starker: BBSI returned +326. 4% versus WTW's +132. 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), Aon plc (AON) is the lower-risk stock at 0.

10β versus Barrett Business Services, Inc. 's 0. 82β — meaning BBSI is approximately 749% more volatile than AON relative to the S&P 500. On balance sheet safety, Barrett Business Services, Inc. (BBSI) carries a lower debt/equity ratio of 10% versus 173% for Aon plc — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Aon plc (AON) is pulling ahead at 9.

4% versus -2. 2% for Willis Towers Watson Public Limited Company (WTW). On earnings-per-share growth, the picture is similar: Willis Towers Watson Public Limited Company grew EPS 1794% year-over-year, compared to 5. 6% for Barrett Business Services, Inc.. Over a 3-year CAGR, AON leads at 11. 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.

Aon plc (AON) is the more profitable company, earning 21.

5% net margin versus 4. 4% for Barrett Business Services, Inc. — meaning it keeps 21. 5% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: AON leads at 25. 3% versus 5. 0% for BBSI. At the gross margin level — before operating expenses — AON leads at 47. 7%, 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, Willis Towers Watson Public Limited Company (WTW) is the more undervalued stock at a PEG of 0. 81x versus Barrett Business Services, Inc. 's 1. 25x. A PEG below 1. 0 is traditionally considered the threshold for growth-adjusted undervaluation. On forward earnings alone, Willis Towers Watson Public Limited Company (WTW) trades at 13. 2x forward P/E versus 17. 1x for Barrett Business Services, Inc. — 3. 9x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for BBSI: 53. 8% to $46. 00.

All stocks in this comparison pay dividends.

Marsh & McLennan Companies, Inc. (MMC) offers the highest yield at 1. 8%, versus 0. 9% for Aon plc (AON).

For long-horizon retirement investors, Aon plc (AON) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0.

10), 0. 9% yield, +219. 8% 10Y return). Both have compounded well over 10 years (AON: +219. 8%, BBSI: +326. 4%), 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 (BBSI (Industrials) and MMC (Financial Services) and AON (Financial Services) and WTW (Financial Services)), which means they face different economic cycles, regulatory environments, and macro sensitivities — making direct comparison nuanced.

In terms of investment character: BBSI is a small-cap deep-value stock; MMC is a mid-cap quality compounder stock; AON is a mid-cap quality compounder stock; WTW is a mid-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.