@Jan1910 You are already sufficiently diversified with the S&P 500. If you really want more diversification then add an ETF with EM. Europe is simply too weak for me and will probably remain weak.
@DonkeyInvestor S&P 500 ETF is cheaper, TER 0.03 - 0.05. Which world momentum ETF do you mean? I definitely think the world ETFs are good and recommendable...