I definitely would not order the OEM bed cover. I had one that came on a 2015 Ram with the rambox. I’ll first say it worked ok. It only flips twice. So 1/3 of your bed is still covered. If at that point you need more open bed space, you’ll need to remove it. Not bad if you’re home, but if not, then you need to stash it in your bed.
Biggest issue comes if you want to go aftermarket. You get specific rails with the OEM cover (black), without, you get silver rails. The silver rails are needed to fit most aftermarket covers. When I went through this, the silver rails cost was around $160 a side. That was about 10 years ago.
I was able to find a guy looking for a cover for a truck he bought used. Luckily he had the same size 6.5’ bed as I had. I swapped out his silver rails onto my truck and mounted my cover & rails on his.
Also, make sure you add the “bed utility group” BUG.