During season 3/preseason 4, I've been seeing AD casters who buy a brutalizer face a dilemma on what item to upgrade it into, Youmuu's Ghostblade item Youmuu's Ghostblade or The Black Cleaver item The Black Cleaver.

Sometimes, I think for sure a champion should buy one item or another. For instance, Master YiSquare Swordboots has his signature Alpha Strike Dash Move, but is more of an autoattack reliant melee carry should buy the Youmuu's Ghostblade item Supa Speed Blade, especially since he can crit with the Q.

In contrast, GarenSquare DEMACIAAA!!! or RivenSquare Ms Toplane Faceroll should buy The Black Cleaver item The Black Cleaver because Judgment Beyblade and Broken Wings Broken Move quickly stack armor shred.

Yet even though Garen and Riven aren't autoattack reliant, I've seen people buy Youmuu's Ghostblade item Youmuu's on them.  Does the extra mobility from the active outweigh the extra health and armor shred from The Black Cleaver item Lucian Killer?