My 1/2" SAE 12 points are vintage Sidchrome (from decades before Stanley bought them out and manufacture was shifted to China), and have never given me a problem in 40 years of usage (other than the 5/8" 12 point plug socket not playing well with two spark plugs from a single manufacturer, requiring me to invest in a 6 point 5/8" plug socket that I could hammer on to get the plugs out).
For years, everything I worked on used SAE fasteners, so I didn't need any metric stuff. However, when I had to do some repairs on a Suzuki 4x4, I needed a set metric sockets in a hurry, and bought a set of cheap unbranded 12 point metric sockets from a discount store. While they were fine for light work, the moment you needed to deal with something more than a lightly torqued bolt, they were as useful as a chocolate teapot.
Before I threw them out and bought brand named replacements, of that set of 8 cheap sockets, the 19mm and 13mm 12 point sockets had both split wide open while trying to remove the 12 point M10.9 grade bolts used to mount the brake calipers on a Land Rover, and the teeth on the 15mm were damaged beyond usefulness while dealing with a 6 point bolt in the same Land Rover's front hub assembly. The 12 point sockets from my Stanley set had no problems dealing with any of those problem bolts after the cheap ones had failed. I know should have used a 6 point socket on the 15mm 6 point, but that was one size that I didn't have in my tool box at the time.