Having lived in the UK, I think I can weigh in on this one.
Americans have their downsides, a lot of ppl are overweight and yes, many American's have poor taste in fashion. However, if you're in the cities most American men dress well and keep fit.
If you go out to the British countryside it can be just as scary looking. And I found a lot of pretention and attitude. Also prefer American accents now that I have lived on both sides of the pond.
I tend to prefer Americans. There's a lot of diversity of looks and I dunno...I found British men either hideous or gorgeous with very little in between.
Now, if I had to choose the best gene pool, I'd have to go with either the Aussies, the Brazilians or the Israelis.
That said...I wouldn't turn down the likes of a Jamie Bamber.