Phantom Dancer vs. Youmuu's vs. Statikk Shiv on Vayne?

It's pretty situational IMO. Statikk is pretty good if you need waveclear/you're stomping lane and the burst would be awesome, though the former is a better reason I'd say. Phantom is just generic and safe, and Youmuu's is good for boosting her kite/chase ability.

PD is probably the best out of them. Youmous used to eb good but the meta is shifting so Shiv and PD are good. I go shiv is we have a mid with little waveclear like Yasuo or liss. PD gives more for late game too just my 2 cents :D

is a snowballing item. It synergizes incredibly well with her ultimate so if you know what you're doing, this item will let you steam roll over your opponents.

If you're doing only okay, though, you should probably just stick with or , depending on which one you need more.