OEM Key FOBs vs Aftermarket Key FOBs: Is there a difference?

What’s the hype over OEM vs non-OEM key fobs? Is there really a difference between the two? First of all, OEM keys, Original Equipment Manufacturer, are keys or key fobs that come from the manufacturer or through the dealership. They have the car’s logo and are expensive. Now, like with all things in consumerism, can…