(SPY)$ $IVV(IVV)$ $VOO(VOO)$ $SPLG(SPLG)$ $ProShares Short S&P500(SH)$ $Direxion Daily S&P 500 Bull 3X(SPXL)$ $SSO(SSO)$ Source from ETF.com When picking an S&P 500 ETF, you should consider the following key factors: AUM.Consider the size of the assets under management, generally the higher the better. Liquidity. Funds with higher average trading volumes are more liquid, and ones with lower trading volumes are less. Expense ratio.As with S&P 500 index funds, S&P 500 ETFs all have similar performance. It is better to select a fund that has a low expense ratiolg...