Invesco's equal-weighted RSP is being compared to other S&P 500 index funds, including Vanguard's VOO. The comparisons highlight differences in investment strategy, with some outlets discussing the potential drawbacks of equal weighting, such as fees and rebalancing drag, while others see it as a viable alternative to traditional cap-weighted funds. The outcome of these comparisons is uncertain, with some sources suggesting RSP may be a better option and others raising concerns about its performance.