I say look at it like this: Ether you get the 3DS version, won't have online multi but you can take it anywhere and all those solo hunts will make you stronger in the end (everything is soloable with proper prepping.) Or... Go the Wii U version and have the Online Multi, still having the choice to solo the whole offline and online mode since there is no change between version besides look and multi and become possibly a stronger team player (...With forumites, randies generally only look out for themselves.) Though the trade off is you can't take it anywhere but you have a large screen to play on. Really the choice is portable, single player game really unless you got friends in the area who have it on the 3ds or, console, can't go no where but have online play.
The choice is yours. Flip that coin.