OEM is definitely the way to go. My father in-law had a U-Haul hitch installed on my Compass and while it does the job well, having hitch basket on the exhaust blows right onto the basket which melted a plastic tote I had.
Needless to say I bought everything I needed to put the OEM one on. All the stuff actually arrived this week, but with the arrival of my daughter, my tinkering time is limited.
Also aftermarket one sit lower which you will bottom out and hit stuff on all the time. There's a decline when I leave work and I can hear the hitch hit it every time I leave.