The thing to know about most asian escorts is that chances are the picture you see is not gonna be the girl who greets you. Most are b&s. That may be fine but dont build your hopes up that you'll get to fuck the angels they show on some of these sights.
Havent had much experience of AW asians, but in general the only place you can more or less reliably see who you book are the old standard agencies: 007, invasian, asian selection, olina. Sexy asian escorts is one that has a lot of the same escorts but Ive never personally used them but you'll find a lot of pros and cons on these boards so make your own choice
As to massage shops - there are definitely some seriously hot girls out there, but remember there are way way more 109 year old boilers. And even when you do get a hot one, chances are she'll try and charge you 80 notes or something for a quick tug job. They are out there, though, the ones you dream about - just if you want to find them youre likely gonna have to spend a lot of cash and suffer a lot if disappointmens before you find them