Ah, well. I haven't had the chance to compare, but his rationale was that, unlike residents, med students have no federally-mandated clinical hour limit, and as no student wants to be the first to say "hey, we've been working for 48 hours straight", they tend to get shuffled about with the rotating staff until an astute attending notices them dragging their feet. He said that, combined with actually getting paid for your work and working in/towards a specialty of your interest, makes residency much better than clinical years.