Ahri or Irelia

Basically, this boils down to whether you want someone for top-lane or mid-lane.

If you like both, grab the one for whichever role you prefer at the moment and buy the other next.

If you are indifferent, grab the one with a fluffy tail.

if you want a top laner: irelia if you want a mid laner: ahri

irelia is banned pretty frequently so you might want to take that into consideration as well

Irelia for butt, Ahri for boobs. :3 Shyvana for best.

I looked at your match history and you seem like the mage kind a guy so get Ahri.