[void_mint]

Just do whatever's difficult. Some days show up and do 10 sets of 3, some days show up and do 6 sets of 4. Total volume is the deciding factor (other than, of course, recovery).

Mike Isratel's work on Maximum Recoverable Volume is probably the best piece of work for deciding things like rep ranges.

[edgyquant]

Also depends on what you’re doing. I have a hell of a time doing more than 3 reps on an overhead press unless I’m lifting light.