It sounds like you prefer Yale, and it seems to be a better overall fit for what you want. And for what it’s worth, I know people that would say Yale is a LOT of fun. Yes, MIT is known for parties but I can’t speak to them personally. My son at Yale is having the best years of his life. If your concern is the curriculum, you can read those details on each school’s website. But you will be well prepared for your future goals from either school, so I’d recommend going where you feel comfortable. Good luck on a tough decision.