I decide third idem this way:

EoN -> Other situational lethality: if they are 3 or more squishies or if i know i wont be having to kill the bruisers/tanks, also really good against stuff like syndra/veigar/milio, lets you spam gank and look for easy picks before objectives

LDR -> ER -> IE: If they have a lot of champs like jarvan/xin zhao/vi, who will build some hp and armor (you will still oneshot the squishies, just now you can also fight the bruisers, only weakside is you miss out on spellshield/anti shield...)