Dude, don't worry about it. Both are fine schools. You probably won't go into the fields that you're interested in right now, so it would be a bad idea to say, "Radiology rules at SLU and sucks at MU (not true), so I'll go to SLU." Two years later you realize that you want to do Derm, which blows at SLU and is great at MU (not necessarily true).
Neither one is going to position you for an easier shot at Derm, Rads, Ortho, Plastics, etc. What will be important is your personal academic record, board scores, etc.