FIZZ or Ahri?

Hi guys, I'm a new LoL player about lvl 28 just about to hit ranked and I'm looking for a champion to one trick or atleast get really good at. Iv been looking at a lot of champions and I have decided I want to get either fizz or ahri. I'm a player that likes to get a lot of kills and carry and not feel out. I'm more of an assassin type of player, going in, getting 1 or 2 kills and getting out. Please tell me in the comments who I should get?
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