Mcgill life sci or McMaster health sci?

<p>I've for a long time had my mind set on going to Mcgill for life sci as it has a great reputation but after reading many forums, I am questioning my choice. I've also heard great stuff about McMaster health sci although I kno it is very hard to get in.
I have a 92% average and not 100% sure about what I want to do in the future...possibly thinking about becoming a doctor but also am really interested in becoming a zoo vet but who knows. I also really want to go to an American university for post grad.
So my question is which program do you think would be the best fit for me, and if you know of any other I'm open to suggestions! I'm looking for a university that will give me a good start, that motivates me to work, but also has a decent social life. I'm just very confused in general.. I'm not sure if a huge university like mcgill will scare me or if i would enjoy it. I'm currently living in Ontario close to Toronto.</p>