I've seen all 3 and have reviewed them all if you check my reviews.
Bell is fantastic and I've since become a fairly regular visitor to her. I've seen her 6 or 7 times now and never had a bad punt.
Izabella - Pleasant girl, epic tits. Probably the best looking of the 3 although thats a subjective opinion. Messed me around a bit with times. Service was ok but not spectacular.
Zoe - Good service but let down by lack of kissing and eye contact.
For me, the choice would be (and is) Bell every time.