My advise is, if you're okay with joint lines, always go for quartz now. It's way more durable and almost maintenance free. Also almost scratch proof. There are some china quartz supplier that also sells the pure white series, just have to look around. As like anything that is pure white, after some time over the years of usage they will definitely turn slightly yellow, be it solid surface, quartz, spray painted doors, laminate doors etc.

China quartz generally isn't crappy, guess the only unknown factor is how they make in the China factory. In terms of stain and scratches both China and branded ones are the same. You are only getting branded if you particularly like a range of color that they offer, and also branded ones comes with proper certification that says you can do your work prep on the top itself without needing any board. (Green certain, bacteria free etc) But us Asians generally tend to use a board irregardless of whether the manufacturer say it's safe or not