On ADCs: Youmuu as last item? BORK over BT? What are you opinions. Please share.

BOTRK does more damage, but the defensive capabilities Bloodthirster is better.

Last item depends on the game - a second PD if youre ahead, GA if behind, Mercurial if even.

Last item shouldn't even be BotRK on Ashe. Honestly GA should be a lot of ADC's Last item. Basically build Damage and then GA. But last Damage item on Ashe? Probably Blood Thirster.

BOTRK is better when they have 2 or more tanks. BT is better when they have 0-1 tanks. Since BOTRK scales off of health remaining, it gets weaker the less health they have. To boot, the added damage is a measly 25 vs. 80, so your skills hurt less by a considerable margin. BT is better for fighting squishy team comps due to this, Imo.

As for a 6th item, I tend to just throw on GA. It deters people from diving me since they'd have to kill me twice.

Youmuu is only good on select ADCs - namely ones who don't need a shitton of attack speed but either have assassin-y patterns or can really make use of the active: Twitch and Quinn come to mind.

For Bork vs BT - there are some champions where Bork is undeniably better - Vayne, Twitch, and Quinn - and some where BT is nearly always better - Draven, Corki. Otherwise its a situational choice based on whether their tank rushed health (bork) or thornmail (bt)

is a snowball item that falls off in late game out side of duels.