I can comment on UCLA as I went there for undergrad and am doing research here now while in my gap years.
Pros:
-Research at UCLA is a must and there are too many opportunities to do it lol. We have 8 buildings (all 5 stories or taller) dedicated strictly to research and this doesn't include the Center for Health Sciences (CHS) where nearly every floor above floor 1 is dedicated to research. If there is any specific niche of research that you want to do, there's at least one lab that's doing it and will be willing to take you on, as long as you're ready to dig in. Of all the schools I have interviewed at, I come back to UCLA and I just think how many more opportunities there are here. It's really astounding.
-You get to rotate in Ronald Reagan which is the highest ranked hospital in the west coast. It was completed in June 2008, and its architecture was designed by I.M. Pei, the man who built the Louvre Museum in Paris and the John F. Kennedy Library, amongst many, many other structures. He built the hospital with the idea of healing and it's the best hospital I can imagine. I'm definitely in for disappointment wherever i go to med school because of the Ronald Reagan haha.
-You are surrounded by the best physicians in the country. Think of a department and I guarantee you we have an amazing physician or two (at the least) in there. Nearly all of them do research and you can join them in doing research. Imagine them as your mentors. Both of the PIs I've had here have been nothing short of amazing, celebrity-status medical role models.
-The concentration of the research, medicine, and housing all in westwood cannot be understated. You walk 15 minutes to class from grad housing, then you go to research which is 5 minutes away, and then the hospital which is right across the street. No need for a car (unless you rotate at a UCLA hospital other than Reagan), but even then there's a reliable bus system.
-P/F is great and the lecture days are short (10am-12pm, I think?). That's out of this world. You'll have more time to study early for USMLEs, study, research, shadow, work out, etc. I think that really allows for self-directed learning, which is Yale's cornerstone, right?
-From the FB photos I've seen of friends who go here, you have a lot fun with your fellow students. They go out, party, drink, beach, Vegas, etc. I just saw photos of a few friends fighting with huge fluffy sticks on a jump machine while in their scrubs...yea lol.
-IF THERE'S SOMETHING YOU WANT TO DO, OR SOME TYPE OF PHYSICIAN YOU WANT TO BECOME, YOU CAN DO IT AT UCLA. No doubt.
Cons:
-Not as much prestige in the name as Yale
-Less Alumni scholarships?
-Honestly, I haven't done enough research at Yale to say anything else.
Great choices you have there though and by no means, should you regret your decision. You'll be grand at their school.