I lived in America for a year. Americans have much more confidence and positivity that people in the UK. They have more energy and are more athletic. On the down side I think they are generally a bit less intelligent and don't think before they speak or act.
In lots of ways life is easier in the US, things are made simple, instead of complicated for no reason. There is a lot more space, outdoor activity, sports and opportunity. But in other ways life is harder, if you are sick, marginalised or unpopular life can be really difficult in America.
I think there was a bit more community spirit in the US than here. Religion seems to be very big in the US. Where I lived it was expected that everyone went to church. It is also essential that everyone drives as there aren't many pavements or good public transport in a lot of places.
In the US people would just say what they think, rather than try and be polite, I think that's a good thing. In the US there is a lot more patriotism and a lack of knowledge about the rest of the world, which is really annoying at times.
Consumerism is much worse there than here, I was surprised by the size of the houses, cars, closets, meals etc. Facilities were better though - school facilities were amazing, plumbing worked, everything works.
But on balance, I prefer living in the UK to America.