That kind of broad statement is just not accurate. As a medical student, you're going to learn the basic stuff, and you're going to learn that at both places.
How much you learn as an M3 or an M4 will depend on how active you are and how much initiative you have. Most of your clinical education will come as a resident in your specialty. Don't worry, you will be a good doctor as long as you put in the effort the whole way through. Northwestern does great in residency matching (comparing the 2002 match lists, I would say it easily beats UIC in breath of competitive specialties, national placement, and prestigious institutions). I don't think those residencies would want NU students if the training was as poor as that fellow said.
Now, cost IS a legit concern. You say you would pick NU any day if you had hte money. If your preferences are that strong, I would make every effort to try to go. Like many of us, you're probably going to loan most of if not, all of your education costs. Keep in mind NU has a debt cap where any loans beyond a limit (I think it's like ~130k? you should check) are paid for by the school. If you took out all loans for UIC, I would think that'd be 30k a year or so for tuitition + everything else, that'd still be over 100k.
