Haven't tried the XS20 before, but I've tried on the B8 though. Personally, I don't think B8 is worth the money at all. The china sounds too 'clangy'. Doesn't have the crisp china sound.
If you can get Nigel from DRMP to place an order for the Istanbul Agop Traditional China, that's a really nice one. I bought mine when I was in Istanbul last year. Really dig it. Crisp and not clangy. But I dunno about price here la... sori...