The iShares one is actually cheaper (TER of 0.07% vs. 0.09%) but it seems its tracking difference is worse (for the last years), so it seems the SPDR performs b

The iShares one is actually cheaper (TER of 0.07% vs. 0.09%) but it seems its tracking difference is worse (for the last years), so it seems the SPDR performs better. However, you can also buy the Vanguard S&P 500 UCITS ETF in Europe, which has also has a TER of 0.07% but an even better tracking difference than SPDR. I don't think liqudity is a problem for such huge funds.