When I worked for a flying school I checked out a couple of UK PPL's. Maybe I was unlucky but I found the level of arrogance rather annoying. Anything that was different from how one operates an aircraft in the UK always elicited a comment about how things were being done wrong. I would advise that UK PPL's flying in North America (an area that has more GA aircraft than the rest of the world combined) keep an open mind and work at learning how things are done where you will be flying.
And no your UK PPL does not make you a better pilot than an FAA PPL.