This cuts both ways as you can see. You'll make far less in the EU generally but you have better job protection and the additional taxes we pay to hire an EU employee hopefully go to government programs you like. However, if you're an in-demand employee who does good work you're going to make significantly more money in the USA generally speaking.
The good news is the UK is compensated better than most EU countries in my experience. But still significantly lower than USA employees in the same role.
However, you get health care out of that and can retire early with a lowered risk in terms of health issues.