Major decision!! Please help!!?

I'm on a gap applying to medical schools (undergraduated), I applied to University of Toronto and Mcgill to study life sciences (as a pre-med course) and got an offer from both of them. Also, I applied to study medicine in uk, and recieved an offer from peninsula medicine school (a PBL medicine school) and still waiting for a decision from Southampton university (integrated system medicine school). Considering my future plans that I want to become a surgeon in the future, and if not probably a dermatologist or an endocrinologist -hopefully- what choice should I make?? Please help!!