This is of course a very tricky question as most people don't have experience of courses based in both countries.
Apologies for the long winded rant. I just think that it's a shame that so many potential PPL's travel so far to receive what I believe to be below standard instruction.
I have trained in both countries and have good experience of both training systems so feel qualified to comment. I believe that most UK instructors who have no US experience have a "mindset" about what they are looking for (someone who does things the way that they do them), when they don't see things done their way they label the performance as "
wrong"...there are numerous minor examples based on actual differences in technique and training. I have seen good students and bad students from both systems.
What I would say is did you see the recent shuttle launch.....terrible airmanship they left the carb heat on all the way into space.....typical example of poorly trained american pilots (yes I am being ironic !)
Chief difference is in attitude
American system is positive and confident - just get on with it you'll be OK !
UK system is negative and pedantic - watch it you might screw up !