Not my Patriot but my old Grand Prix had a fender replaced when it was almost new. That would have been 2001. A girl either ran a stop sign or started up too soon and got my rear fender. Overall I was pleased with the body shop, but I suspect they didn't use OEM parts. Never a problem early on, but I kept that vehicle 10 years and 250,000 miles. As the vehicle got older that fender was the only one that showed rust. The rust was certainly manageable -- not like it was rusting away, just showing spots here & there.
So if you're planning on keeping it for a long time I'd suggest going with the better parts. If you're the 5 year / 100,000 mile type, then go with the cheaper one. It will be gone before you notice any problems.