Ahri or Viktor who should i buy?

I have been maining mid lane and I am looking for a new champion to learn, currently I have been playing twisted fate and lux, I really like ap mages as you can see, i was thinking of either ahri or viktor; if someone could give me some tips I would highly appreciate it, even if I named only these two champions if you want you could suggest me other ones, the important is that they aren't assassins as they are not really my thing. Thanks in advance and I'm sorry if I've made some grammar mistakes but english is not my mother tounge.

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