Which is better Nautilus or Ahri?

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which*

They're both very different champions so without knowing you personally in terms of your play style it would be hard to make a judgement call. But I personally prefer Naut for entertainment purposes.

If you just want to play one role, than Ahri. She is always one of the best mids.

Nautilus is better all around since he can top, jungle, or support and do well at all 3.

I'd rather do Nautilus because the odds of my soul being devoured and/or getting every STD known to mankind is much lower.