Ok, so I'm going to preface this by saying it's a second hand anecdote, but I figure I'll offer it anyway...
One of my best friends is good friends with an M1 at Rush - and they went out for her (the M1's) birthday with a bunch of her classmates. My friend said all these students were the biggest drunkards she'd ever seen - complete with students puking in the corner. She said she'd never want any of those people to be her doctor.
Like I said, it's a secondhand anecdote
But besides that, UIC rocks. And its way cheaper. And you have way more clinical sites to choose from, and a much wider patient base. And - you'll have a bigger (and better) network after you graduate - 1 in 6 physicians in IL is a UIC grad, and from what the docs I know have told me, fellow alums are always really ready and willing to help each other out...