While AW is far from perfect, and has had a few ex-street girls migrate on there, I personally have serious reservations about ViVa St, as I beleive it's open far wider to scammers, B&S merchants and potentially dangerous situations, as it's unpoliced and unverified.
Trying find a genuine WG on Viva St is like trying to find the one small prize in a bran tub.
For the time being, will stick with AW and its foibles, as with careful research I managed to pick some decent ladies.