fizz jung ad or ap?

ap if you want to be an annoying but decent assassin.

devourer trinity tank items if you don't want friends and like to make people suffer.

You should build him a sacrificial altar, and then sacrifice him to your lord Satan for even considering using this evil champion.

AP.

But....why?

both, devourer+guinsoo and then see wether you need to get tanky or can go for gunblade