TSLX vs FSK vs ARCC vs GBDC

For growth investors, Golub Capital BDC, Inc.

(GBDC) is the stronger pick with 42. 5% revenue growth year-over-year, versus 0. 1% for Sixth Street Specialty Lending, Inc. (TSLX). Golub Capital BDC, Inc. (GBDC) offers the better valuation at 9. 3x trailing P/E (9. 2x forward), making it the more compelling value choice. Analysts rate Sixth Street Specialty Lending, Inc. (TSLX) 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, Golub Capital BDC, Inc.

(GBDC) is the cheapest at 9. 3x versus FS KKR Capital Corp. at 278. 4x. On forward P/E, FS KKR Capital Corp. is actually cheaper at 6. 4x — 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: Golub Capital BDC, Inc. wins at 0. 30x versus Ares Capital Corporation's 0. 96x — a PEG below 1. 0 traditionally signals the market is underpricing earnings growth.

Over the past 5 years, Ares Capital Corporation (ARCC) delivered a total return of +47.

0%, compared to +16. 3% for FS KKR Capital Corp. (FSK). Over 10 years, the gap is even starker: TSLX returned +142. 2% versus FSK's +11. 2%. 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), Sixth Street Specialty Lending, Inc.

(TSLX) is the lower-risk stock at 0. 63β versus FS KKR Capital Corp. 's 0. 87β — meaning FSK is approximately 38% more volatile than TSLX relative to the S&P 500. On balance sheet safety, Sixth Street Specialty Lending, Inc. (TSLX) carries a lower debt/equity ratio of 108% versus 131% for FS KKR Capital Corp. — giving it more financial flexibility in a downturn.

By revenue growth (latest reported year), Golub Capital BDC, Inc.

(GBDC) is pulling ahead at 42. 5% versus 0. 1% for Sixth Street Specialty Lending, Inc. (TSLX). On earnings-per-share growth, the picture is similar: Golub Capital BDC, Inc. grew EPS 4. 4% year-over-year, compared to -98. 1% for FS KKR Capital Corp.. 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.

Sixth Street Specialty Lending, Inc.

(TSLX) is the more profitable company, earning 47. 3% net margin versus 0. 9% for FS KKR Capital Corp. — meaning it keeps 47. 3% of every revenue dollar as bottom-line profit. Operating margin tells a similar story: GBDC leads at 78. 9% versus 49. 5% for FSK. At the gross margin level — before operating expenses — GBDC leads at 81. 5%, 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, Golub Capital BDC, Inc. (GBDC) is the more undervalued stock at a PEG of 0. 30x versus Ares Capital Corporation's 0. 96x. A PEG below 1. 0 is traditionally considered the threshold for growth-adjusted undervaluation. On forward earnings alone, FS KKR Capital Corp. (FSK) trades at 6. 4x forward P/E versus 9. 9x for Ares Capital Corporation — 3. 5x cheaper on a one-year earnings basis. Analyst consensus price targets imply the most upside for FSK: 50. 8% to $16. 50.

All stocks in this comparison pay dividends.

FS KKR Capital Corp. (FSK) offers the highest yield at 25. 6%, versus 2. 0% for Ares Capital Corporation (ARCC).

For long-horizon retirement investors, Sixth Street Specialty Lending, Inc.

(TSLX) is the stronger choice — it scores higher on the combination of lower volatility, dividend reliability, and long-term compounding (low volatility (β 0. 63), 10. 1% yield, +142. 2% 10Y return). Both have compounded well over 10 years (TSLX: +142. 2%, FSK: +11. 2%), 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 Financial Services sector, making this a peer-level intra-sector comparison — the same macro tailwinds and headwinds will affect both.

In terms of investment character: TSLX is a small-cap deep-value stock; FSK is a small-cap income-oriented stock; ARCC is a mid-cap high-growth stock; GBDC is a small-cap high-growth 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.