I wouldn't personally build the Youmuu's.

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Depends on your runes and masteries, if you're full-out offensive in the mastery tree, and on runes you have ArmP on both marks and Quints, getting Youmuu's early would be a waste, because you'd more than lower their armor to 0, so I'd recommend getting a little defense early, and get youmuu's later. Also, getting Trinity Force early is a basic new player mistake. It scales with level, so I find that until you're in late-game, other items will be better. Trinity force still gives great power in lategame, and so does Sheen.
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I main Wukong, and he's the only champion in a -very- long time I've found great success with. When I say that I mean average 6+ kills and 3 or less deaths, almost every single game. I've found great consistancy with him, and for this I am thankful. It's been long process of finding that next hero I could do well with over and over again.
That said, which build is better?
Wriggles Lantern, Mercury Treads, Trinity Force, Warmogs, Atma's Impaler, Infinity Edge then sell Wriggle's for The Bloodthirster.
Or
Wriggle's Lantern, Mercury Treads, Youmou's Ghostblade, Warmogs, Atma's Impaler, Frozen Mallet, sell Wriggle's Lantern, buy a Bloodthirster.
Or perhaps you have an even better build than these two. If so please share