Which Olivia (YT)

cut your nuts off for using 2 dancers with Reinhardt and brave lyn

I like +spd better on her because 34 still gets doubled somewhat frequently. However, in PvE 34 might actually be enough a lot of the time, especially if you add fury. The other thing to consider is that +spd offers her better offensive potential in those few instances when she does decide to take matters into her own hands.

I consider YT Olivia a really good GC unit, so if you do that then I recommend +spd. If you're going to stick to PvE and you even get some ally support going, +res -atk is probably fine.

If you want to use her in arena you should probably give her a duel skill so I say superboon shouldn't matter.