One reason, though not the only, is the high number of ICU (or ICU-by-another-name) months. Just a matter of what you want. The program's graduates have a reputation of being fearless in critical care situations because of their wealth of experience (that is supplemented by a very high threshold for transfer to the unit), but are perhaps weaker in outpatient care.
Khaos--What you're referring to is a more old school definition of call, and one that is certainly still used in the private world, especially among specialists (and among fellows, now that I mention it). Although this is not without exception, being on call as a resident means being in the hospital either admitting new patients (long call meaning overnight, short call meaning til 9pm'ish) or covering someone else's patients while they are not in the hospital (depending on the coverage system, this could be the responsibility of a long call team or a nightfloat team).
