Protolabs and Xometry for when you want the most aggressive sales, least supportive support, worst of Chinese quality and the highest of Western prices.

PCBWay and JLCPCB for when you want good quality at great prices.

Craftcloud for when you want the best quality to price ratios, and want to decide on country of origin.

Not China, but I have used this EU based service with good results and fast delivery

https://www.craftrum.eu/

Wenext. I used it from single quantities up to a couple hundred pieces. They assign a human in the loop to check your model that you can email to.

As I remember, both PCBWay and JLCPcb (both originally PCB manufacturer) now offer 3d printing service.

Xometry, though it's also US and EU based.