Get a practical RSP vs SPY comparison covering weighting methods, historical performance, diversification, concentration, mega-cap exposure, expenses, volatility, and liquidity. Learn why SPY may benefit when large companies lead the market, while RSP can gain when market participation broadens. The guide also explains how VOO and IVV fit into an S&P 500 ETF comparison. https://financenovels.com/blog/rsp-vs-spy/