Fritzing fab is competitive priced compared to local Fab houses, with the advantage that someone verifies the actual file, domething that most fabhouses don’t do. If it looks ok in a gerber viewer then thats enough.
Some are even fully automated and nobody looks at the file, they just produce whatever you upload.
I have seen very nice results from chinese fab’s, but triplecheck the actual gerbers before you upload them to china
A friend of me uploaded a gerber from kicad that had several traces missing due to a bug. And when ordering from china then it is a bummer when you wait for 4 weeks only to receive pcb’s with several traces missing because you forgot to check the actual gerber files.
My singlesided PCB’s i DIY, for doublesided there is a lot of choice in the PRC. And some have a choice of funky colors, PCB thickness, HASL, ENIG, copper thickness.