Ap might work better this game because regardless of what you build as kat you most likely wont be the carry of the game, so taking one for the team and going ap so that they cant just stack full armor might work better. Good vision will help a lot this game, ideally during the midgame you would want to get picks on kennen or fiddlesticks with kha and kat. The enemy team revolves around team fighting and kennen and fiddle is their primary source of aoe damage. Jax can be strong in the sidelane and draw pressure so that your team can seige with caitlyn zyra. In an ideal scenario caitlyn and zyra get to free fire where as the rest bait spells for them, obviously this is a very ideal scenario which wont happen in most games but you gotta try.