I write estimates and this is always my preference. An A graded factory paint used oem bumper/ bolt on panel beats an aftermarket part everytime. Shops don’t like used parts because you have to negotiate with the vendor when they come in with more than one unit of damage, and you have to add more lines to the estimate to clean up or de-trim them. A good bodyman hates aftermarket parts because it makes getting the job perfect impossible. Bad body men like that they can use the aftermarket part as a scapegoat as to why nothing lines up at the end.Progressive specified used bumper covers on my Tuscon when it was rear ended. The body shop said the OEM used stuff is better than alot of the aftermarket anyways and they painted it to match.
Shops make 50% reselling profit for the aftermarket part compared to about 20-30% on used /new and if they are not quality focused they will sell the lie that aftermarket fits just as well. They don’t. They will also rust out way faster than an oem panel in the long run.
Depending on the make of vehicle you can try to find a quality focused shop that will participate in price matching OEM parts, the smarter business will do this and take the hit on parts profit to increase customer satisfaction, reduce workload (returns) for their parts personnel and to give their techs the best possible product to work with.