Personally, If only a choice between an 85 grain pill (especially frangible) and FMJ 115gr or heavier, I'm choosing FMJ!
I'm a believer of standard pressure 147gr for penetration and expansion, like HST. My CZs shoot the tightest groups with 124gr ammo. 124gr stuff also performs well in FBI penetration tests. HST, Gold Dots, Ranger T; all good to go.
I still have a partial box of (I think) 90 grain non toxic crap, just to check the outer bounds of functionality/reliability testing. Made a mistake when originally purchased them, I don't think I'd ever buy anything less than 115gr for 9mm again and if 124 gr is available, nix the 115.
YMMV and I'm sure the speed freaks will pipe up to the contrary!
Whatever you do, you owe yourself to make sure your SD fodder feeds, ejects and goes bang. If a new gun go ahead and break it in with target stuff, clean wipe dry and finally test out your SD stuff for reliability.