A lot of it depends on what accessories, the spray in bedliner is about the same from Ford as aftermarket, and same basic quality. The beadlocks, OE beadlocks are only beadlock compatible, you still have to spend $216 +/- for the rings per wheel, so aftermarket are better price and more selection.
When it comes to other OE accessories, if you want things like the bed extender, bed partition, tonneau covers, etc. If OE, get the Ford part number and buy it online/Amazon...if was interested in the bed extender and partition, and even after the dealer offered me 20% off if I bought at time I purchased my Raptor, it was still cheaper for the Ford parts on Amazon....same with other parts like the 2019 engine cover, 2nd set of OE Raptor wheels as new takeoffs on craigslist.