When it is time for new pads, you can buy original-equipment (OE) pads from the dealer or aftermarket pads from a parts supplier. Both can be excellent - the key is quality, not just the label. Here is how OE and aftermarket brake pads compare.
What OE pads are
OE (or OEM) pads are made to the exact specification the vehicle came with, sold through the dealer. They are a known-good match for your car's braking feel and are a safe default - but you usually pay a premium for the badge, and they are often made by the same suppliers that sell aftermarket.
What aftermarket offers
Aftermarket pads come in a wide range, from budget to premium. Quality aftermarket pads from a reputable maker can match or beat OE performance - and let you choose a friction type suited to your driving, like quieter ceramic or grippier semi-metallic; see friction material types and ceramic vs semi-metallic.
The quality caveat
The catch is that the aftermarket also includes cheap, low-grade pads that are noisy and wear fast; see are cheap rotors worth it. The choice is really quality vs junk, not OE vs aftermarket - a good aftermarket pad beats a cheap one every time.
How to choose
Pick a reputable brand and the right friction type for your driving, whether OE or aftermarket. Pair the pads with fresh hardware and a proper bed-in; see why brakes squeak. Browse quality brake pads and hardware.