Thank you very much! I'm glad if it helped! :)

Generally if they have a lot of squishy champs crit will do you wonders, killing enemies very quickly. Though going crit reduces your own survivability so you gotta watch out for it. The Attack Speed build is more suited for prolonged fights, as with one rotation of your kit (which can be done in less than a second) you get all of Terminus' MR and Armour, alongside with your third item being a defensive one. AS build is also better against tank heavy matchups as you can later build BOTRK on your third or fourth item, giving your insane tank shred with you already high attack speed and On-Hit effects alongside being able to posses souls instantly.

TL:DR
AS against prolonged fights and tanks
Crit against squishy enemies and shileding allies.

Doesn't miss for me either!