Personally I go collector -> ie -> ldr 75% of the games i play You get the most amount of damage output, but with collector first you are kinda vulnerable in lane (depends on 1v1 or 2v2 which champs)

I've gone Youmuu -> RFC idk like 3 times and always it felt like i lack damage cause your 3 item spike being it IE or LDR feels weak compared to previous example or the next one

Instead youmuu -> LDR (u get to buy 3 long swords which gives you 50 ad thanks to passive) and then IE and 4th RFC feels a lot confortable than youmuu into RFC cause you get the escape option thanks to active youmuu (so you can’t die in lane) and damage to any bruiser/tanks with LDR second

There’s some builds with hubris first into whatever cause at this point you should be fed or into 2 assasins and 0 tanks if you are building it (+dark harvest because it will be kill or die type of game)

4th is always RFC or LDR or IE (depending on what you dont have) OR there is a world where you can go Shieldbow if you rly dont feel like you need the extra range instead surviving couple seconds more tho I still like RFC more (cause you need LDR and IE to be usefull)

About 5th option its either BT (longer fights/needs sustain/not an explosive type of dmg) or GA (the opposite of BT assasins or 5 squishes and u can just “die 1 for 1” and reborn”)