It depends entirely on what field of medicine you are interested in. You can find US news rankings of hospitals, categorized on specialty to give you an approximate idea of how good the programs are at each institution you are interested in. In terms of comparing what specialities are more competitive and difficult to enter, you can refer to several books (i.e. iserson's getting into a residency), or simply talk to older medical students or residents at your university. usually, when it gets closer to the time when you are applying for residencies, you'll get some counseling from your school to see what programs you may be competitive in depending on your grades and board scores and other factors.
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northwestern -2006