The Best Global ETF is Vanguard FTSE All-World UCITS ETF, but iShares MSCI ACWI UCITS ETF is a strong challenger. The Best Developed Markets ETFs are iShares Core MSCI World UCITS ETF and HSBC MSCI World UCITS ETF. The Best S&P 500 ETFs are synthetic funds from Invesco, Xtrackers, Lyxor and Amundi.