Ahri will always be towards the top of the meta.
She has a consistently high win rate. While few other champions enjoy that patch after patch, Viktor included.
Logically you'd want Ahri out of the two choices, unfortunately you'll be compelled to down vote anything with the words "Ahri" and "balance" in the same paragraph. It's one of the side effects of being an Ahri main, or making gross jokes about her appearance.
If you really want to easily carry this patch though, I'd look at Lux or Zed. I'm unclear about their future, Lux especially seems to rightfully be receiving much criticism on her safety, but you can carry easily this patch as them. Zed is a bit harder to learn, but you can get a lot of done with the little Zed experience you have.