Xin Zhao: Warrior or Devourer?
I like jungling XZ, along with Reksai and Olaf, but I never really know which item to choose for Xin Zhao. I've done both Warrior and Devourer builds and they both work really well. Warrior helps scale my Q/R but not my E/W, gives me solid armor pen for my ganks, and just in general is a nice immediate power boost, even if it falls off later in the game.
Devourer scales slowly but ramps into being incredibly powerful, gives me a decent amount of mixed damage but doesn't scale any of my abilities. However it gives me a little more freedom when building because I can go tankier earlier and just farm up a little to get some damage.
What's the "optimal" build for Xin?