You'll only really appreciate the issues related above once you have done a PPL, and then it's a bit academic.
It's not a life-changing 'mistake' either way. Do your research and make a decision. If you decide on the US and later decide it was not as good as you expected, you'll still eventually get a PPL and can join the list of people who warn others against the somewhat optimistic US flight school marketing and the differences when you get back.
Most right-minded people will figure out that they have to do some work to get comfortable back in the UK, and get over the 'cramming' forgetfulness to re-learn stuff.
Make sure you have a budget for the UK costs, because if it doesn't work out as well in the US as you expect, that's what you'll end up spending anyway!
Good luck
BW