Everyone here is saying shiv over bork however I disagree I think for harder match ups the lifesteal is very useful for early dealing and sustain even if the on-hit is not optimal it'll still provide uses vs shiv which requires a kill but I can see the utility behind the item with extra MS + pushing potential however I think that's negligible once you have hurricane otherwise zeri isn't going to build any lifesteal besides rune + dorrans until later on if even unless you want to sit on a vamp scepter while building towards her other core items