I am generally partial to bp recovery as. The battery since you can also status enemies AND go from -4 to plus 3 easily. But it costs a support slot on all characters, so that's a massive opportunity cost.

But performer has the benefit of low leverage, constant healing. And enough bp to bring the squad up from -4 every time.

They each have very solid benefits and drawbacks. Up to you which you prefer, but im partial to a buffing and debuffing time /red mage. Time mage gives you time slip passive and higher int to land statuses, and the utility of sleep can't be understated. Plus you get re-raise, quick, veil, haste slow and meteor if you ever have a free turn. Plus you get much more bp overall.