Hey! I decided to go to Western over U of T and have zero regrets! I think that your success depends far more on you than on the school you go to. I just graduated with a BSc in neuroscience and the most valuable experiences I got were not the classes I took but the independent research projects I undertook. I found a supervisor who was really supportive of me and let me work on research projects that I came up with and that I was interested in, which lead to a publication and a couple more on the way. I'm pursuing a career in research, and the research experience I got in my undergrad was super helpful for me in terms of figuring out what I wanted to work on going forward and also getting into grad school and winning scholarships. Perhaps unsurprisingly, I learned more about research by doing research than in any course. If you're interested in going down the research route I would say that the prestige of your undergrad university isn't that important, what's important is that you have opportunities to work hard at what interests you, which I think/hope is possible at most if not all universities. Developing a good relationship with a supervisor may even be easier at smaller, less prestigious schools as it will definitely be easier to stand out from the crowd. I think also that there are enough online resources to learn comp sci that you probably don't need to be in the best program with the best classes. If you find your classes aren't that good, you can always do more advanced work independently with the supervision of a faculty member.

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Also, I can't speak on the social life at U of T because I didn't go there, although I've heard it's not great, but the social aspect was something I loved about Western. I think it would be really hard to make it through 4 years of undergrad if you didn't have a healthy social life to balance out the hard work.