I prefer hitch mounts myself but that's because my wife & I both drive SUV's & it would be a pain trying to get them up & down from the roof, the one thing I don't like about hitches for cars compared to trucks & SUV's is the car hitches mostly come in 1 1/4" which are very weak compared to the bigger 2" models and are easy to overload and bend. I see more damaged/totaled bikes from failed 1 1/4" hitch mounted bike racks then damaged/totaled bikes from low overhead strikes ( and we have tons of under ground parking lots here). The one good thing I like about having a hitch is it's got other uses like using a cargo carrier ( which I leave on my Bronco 99% of the time) or towing a trailer.

Glenn