Ok...for me...and this is from a bb'ing approach...
say I'm curling 135 for sets of 8.
If I get 8 on all sets...then I shorted myself on the first set at least.....that is assuming you are going to failure.....
My reps would be
8,7 maybe 5.
To get the same reps on all the sets then I would only have doen 5 reps on all three sets......you cheat yourself on the front end..
...picky I know but....that's why for size I prefer pyramis of 15,12,8,6,4 reps.
along the same lines I am starting a new program that after warm-ups I am only doing 2 balls-to-the-wall sets of each exercise...3 exercises total....so - 6 working sets per bodypart