One bad thing about non branded bearings are, sometimes even when they are claimed to be stainless, it’s only the outer part of the bearing and not the inside, I have seen some like these.
Spin time is not an issue with modern yoyos even with a cheap bearing as long as it’s properly clean it will spin very long. I only have tried a few high end bearings but what I can tell is they tend to be somewhat smoother, quieter, and have less slop, little difference on spin time.
If you want more spin time, clean the bearing and don’t lube it, or use dry lube.