Well I trained in Scotland, glad I did as I feel I got good training. However I have flown lots in the States, in fact ive flown all over the States in both single and multi engine aircraft, I have seen every variable of weather imaginable, I have faced more operational challenges over there than I ever will here. Most people train in Florida, the sunshine state as they say........except the summer months when its so turbulent you feel sick, the humidity is so intense that the ASI steams up on the inside of the face, thunderstorms like i've never seen in my life with downdrafts, windshear, microbursts to name but a few.
whether you train here or eslewhere it matters not, a plane is after all a plane and when you paint the letter 'N' on the tail it does not fly any differently, we all fly within the earths athmosphere with its constanly changing weather systems and all locations of the globe have their own challenges for the unwary aviator.
Chose a good quality school, study hard and be safe......