Gold is the enterprise ones. Black is enthusiast, blue is desktop, red is NAS, purple is NVR, green is external. Green you almost certainly don't want (they do their own power management), red is likely to be SMR. But otherwise they're not too different. If you saw a lot of blues failing, it's probably because the systems you supported used blue almost exclusively.
Gold is the enterprise ones. Black is enthusiast, blue is desktop, red is NAS, purple is NVR, green is external. Green you almost certainly don't want (they do their own power management), red is likely to be SMR. But otherwise they're not too different. If you saw a lot of blues failing, it's probably because the systems you supported used blue almost exclusively.