I went to a Med school with drip system and am at a program now with call days. For me, I hated the drip system we would always get buzzer beaters and we ended up staying an hour past sign out, then another 30min to track down the night float residents who were busy running around doing admissions. Furthermore, we were persistently capped.
With the call system now, sure call days are busy, but on your pre and post call days your census can get down to single digits so rounds are fast and you have lots of time in the afternoon to catch up on reading and teaching. As an added plus at my program the precall days are half days.