I was trained in fixed wing at Van Nuys CA in 1994 (IR Louisville KY 2000) and rotary in the UK in 2002.
Without a doubt aviation is more evolved in the USA and far more user friendly. I would say that standards of training are comparable and that it is not possible to generalise...
But in my experience (he says generalising massively...):
In the US you have to learn to get slick on the radio fast. There were often 5 or 6 aircraft in the pattern - many commercial a/c and jets.
When I returned to the UK I really couldn't believe the number of miserable old farts involved in flying here - generally older men who were very quick to criticise the US system despite having had no experience of it themselves - the anti-GPS brigade. Jealously guarding their rusting ill equipped elderly cessnas. The US is generally younger (aircraft and pilots), more positive and has a far more "can do" mentality.
In the US getting a temporary airman certificate on the day you pass your test so that you can go flying immediately beats the hell out of waiting for the license in the post before you can fly.
As I previously stated we should not generalise though - experience on both sides of the Atlantic is valuable and should be respected.