Don't think there is a best China site for me. I use various depending on the best deal. Recently have used Vapesourcing, 3fvape and Health Cabin. No issues with any of them.
Yeah, Sourcemore for me, sometimes you drop lucky & it's EU stock you're ordering
Fasttech's delivery has been shocking since the pandemic but I've always received my orders from them. I find they're not the cheapest anymore either, Sourcemore will usually smash them on price