Don't also forget the cost of getting to Florida, living costs, car hire and the cost of 4 weeks off work. Oh and TSA approval to train and the fact you can't change schools if you don't like it.
I doubt it makes much difference where you go, the US gets you your ticket quickly, and its better than giving up half way through because of poor weather in the UK. (it does rain in Florida though- try Arizona for guaranteed weather). On the other hand you get used to making weather decisions in the UK. Good/bad instructors, schools, planes exist everywhere.
Most people seem to choose their school based on how nicely they are spoken to when they walk through the door. Go to the schools, make your choice.