tldr: I've tried both and settled for UK, but will soon move so US might be back on agenda.

The US has a wider range of climates and there are also very few places that have climate as horrible as the UK/Ireland. The wages are at least double on average for professional jobs and the houses/cost of living is low too. Insurances of all kinds are generally good value, whereas the NHS for example is just underfunded and therefore too much pressure.

Although there is more to life than finances, my day to day experiences of living matter to me more and so I prefer UK cultures on average,whether that's the way of doings, the culture in the workplace, with people everywhere etc etc.

But then there is Brexit....and that's ruined everything, London is the best place on this planet but that's going down the drain soon I bet, so I'll be going back home.