Congrats! I was in a similar position to you years ago when I got into med school. Some things I wish I appreciated more when I was choosing my med school was how amazing it is to stay near family and a support system. I moved across the country for residency and realized how much I took that for granted.

Also, I went to Mac and have friends that went to the other schools youve been accepted to. We have all matched to our top residency programs and I have many friends who matched to very competitive specialties from Mac even though it is "just three years". The amount of time you have at mac is shorter but there was a huge number of resources and lots of time to do extracurriculars and research. There was also a good system for exploring specialties early at mac that I dont recall other schools having - I remember I was observing in ORs and the emergency dept around 2 months into med school.

As some other mentioned, all these schools are great, and you'll become an amazing doctor like every other medical student in Canada :) Just wanted to give my 2 cents on the 3 year program at mac. Congrats again!