I got into both but I'm really confused on which school to pick. I'm not really sure about what I want to do with my career. I would like to work on some of the startup ideas that I have or maybe work in finance/AI space.
UPenn:
+ Possible double degree with Wharton
+ Less stressful/more social life?
+ More prestige in VC/business world?
CMU:
+ Better professors for CS/Better CS Education
+ More CS Prestige (#1 for CS)
- Stress culture
Would I miss out on any CS opportunities (jobs, interships, startup opportunities) by going to UPenn instead of CMU?
I would personally choose Penn in your position because my guess is that more non-CS people have heard of it and know it's a top school, and like it or not that kind of name recognition does help you out in various things.