I learned a valuable lesson about "OEM" quality when buying a replacement outside driver's side mirror for a '92 Lumina.
Original mirror was made in Canada. Car was assembled in Canada. SWMBO backed out of the garage, knocked the driver's side mirror off on the framework of the garage door track. Mirror was ~10 years old, had a rock-chip or two in the black plastic housing. The mirror and black-plastic housing was otherwise in good condition.
I went to the local Chevy dealer, bought a new mirror in a Genuine GM box. The "new" mirror was made in China, and the black plastic faded to grey in six months. Bastages.
When she knocked THAT mirror off on the side of the garage, I went to the Treasure Yard, and bought three left, and three right mirrors, made in Canada, and wonderfully black after years of service.
The difference between the budget component and the expensive version is often nothing more than the length of the warranty, and the color printing on the packaging. In some cases, it costs too much to tool-up an actual difference in the parts, the difference is in the marketing.
But without significant experience, there's no way for a consumer to know what's what. The only thing you can be sure of is that NOBODY goes to China or Viet Nam to improve quality. They source from the third world to improve profits at your expense.