User blog:Tails365/Phantom Dancer SV Statikk Shiv

So I'm guessing this has been going on for a while but, which is better? These are the stats:

Statikk shiv offers 10% less AS, 10% less Crit chance, and 1% more MS. It's 300 gold cheaper. It's passive is easily procced by gap closers and MS buffs. It does 100 magic damage, but it's AoE, can crit and IE's passive affects it. Phantom Dancer ignores unit colision, which really helps with your escapes / chaces.

I prefer PD because of the raw stats, but since I've been playing a lot of Quinn, which uses a LOT of MS modifiers, i'm kind of stuck. So here's the question: when is one better than the other?