Neurology and IM are relatively similar in comparison. Top programs all have similar cutoff scores (usually 220-240), but in general, Neurology programs look for sincere interest in Neurology (subIs, research, participation in SIGN). Neurology has a lot less spots than IM, as well. As gutonc mentioned before, you should choose a specialty based on your interest, not based on how easy it is to match a particular location. If you're not gung-ho about neurology, I would do IM. Chicago has a lot of programs - the academic ones are super hard to match, but you should be able to get into a community program if you play your cards right.