Difficult one for me to call as they're my 1 and 2, with Zoe just edging it.
Depends what you're after, but Zoe is a great punt who I could recommend to anyone as a guaranteed good time. Great role play, particularly as the dominant partner.
However, foxxy is more milfy, offers a greater range if services (anal, swallow, fisting, squirting) and is very good as a submissive partner ie. schoolgirl, maid, secretary.
A bit more detail about what you're looking for and the role play you have in mind would help.
One last thing. I'm the only one to have reviewed foxxy, so its my opinion alone. Zoe has a number of reviews from different guys which might sway you. I'll be going back to both later in the year for my 'fix' of what they offer.
If you want to really push the boat out, Zoe and Abbie together as a role play are mind blowing.
On the role play, make sure you're clear on what you want and provide as much detail as possible as it helps them to deliver.
And good luck. Leave a review when you're done.
tcm