Zed or Viktor

Viktor for the suprise factor. No one thinks Viktor deals damage, and no one expects a skilled Viktor.

Viktor deserves more attention.

I haven't played much Zed, but I think Viktor is really fun.He's great in a teamfight, and has a variety of build paths. I have no regrets about picking him up.

Viktor can carry extremely hard if you snowball with him a little. The damage output with him is absolutely insane. He definitely takes a little skill to play properly, but he can seriously be scary as hell. I'd say go with him, he's so underplayed, yet really OP.

Neither is better mid all champions have their strengths. Zed if you want a Split Push/Pick Off comp. Viktor if you have a more team fight oriented comp.