As well as the weather, the amount of money you have to spend, whether it's a lump sum or you're paying as you go, is a BIG factor. I'm working full-time and so can currently only really budget for about 1 lesson per week...obviously the weather has something to say about that a lot of the time
I've heard tales of people doing a crash-course PPL in sunny Claifornia/Florida in a matter of weeks, only to come back to the UK and be thrown by the, generally, much crapper weather. It may be cheaper but I quite like the idea of having to put up with more adverse conditions (bit perverse of me maybe!) here in the UK, especially in my formative piloting period...!
Happy landings,
V1R