I think it depends on the person and their genetics...I
ll use myself as an example. I am no muscle whatsoever. I mean I did a bodybuilding split with good volume and diet and everything, but I just didn't gain muscle. I switch to a strength routine and my strength skyrocketed and gained mroe muscle than doing a BBing split.
Plus, most PLers don't have to be fat. There's some that compete in meets with 10-15% BF.
But BB and PL is VERY different. Powerlifters have a definitive goal, a number, to measure themselves against. But with BB, it's very subjective. BB can boost confidence but there is no definate way of accomplishing a definate goal.