Vanguard's S&P 500 ETF has a 12.3% higher time-weighted return than iShares' since 2002. Volatility is 18.7% lower for Vanguard based on three-year standard deviation. The comparison uses trailing returns and standard deviation metrics. Both track U.S. equity markets.
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Summary by ByteBrief
Vanguard VONG and iShares IWO compare 2002, present returns