Ohh, some pretty good ninjas you got there.. Well, i would say that the Water Main build is a wall.. And it wont be easy to defeat since youve got Iruka to 5* and Sailor Sakura to 3*.. Not to mention the 4Tails Naruto too.. For the Wind Main part, i guess thats better for world boss..
Hm, I do enjoy the wind damage for world boss, although my fire build still does more, probably because my anko is powered hard.