I don't know what you're trading but you should just backtest it because the results you find for your trading instrument will be different than the results for someone else trading a different market. wrbtrader
I trade less volume in mornings after holidays and Friday afternoons, otherwise all the rest the same. By the time Friday afternoons come, most are shutting down and don't want to spoil the morning session.
I agree, friday is for me many times not as good as the rest of the week. On saturday and sunday I never have a losing trade.
Welcome to ET anyway, Lukas: if the reputation that precedes you is at all accurate, I strongly suspect you'll find it rather more to your taste than your previous haunt ...
Fridays is my best day, second but complex(a lot of action, but sometimes difficult to read) is Monday.
Trump tweets seem to be ignored these days thankfully, they where a nitemare, massive market move for no reason, no scheduled news and arggghhh!!