Vicky for sure! Less show, more feeling when performing (or at least it looks like it).
Plus I prefer cute over dirty girls.
Finally, Vicky is from Norway, and I'm a fool for scandinavian chicks.
It's all about taste as both are excellent performers and PSEs too, but Ava is nastier with clients than Vicky is known to be. However, Vicky is hotter to my taste so I would choose her over Dirty Ava!
I would have went with Ava as I dig the filthy talker type of gal but since she got her boobs ..shifted.. into the ugliness they are now, I'll have to stick with Vicky!