More space on the move

Which to have a trailer hitch or a roof trail for the new car? At the dealership we were contemplating which one would serve us better for our extra load of luggage if we travel. Most commonly use of roof rail with additional storage box and there are many brands to chose from. As for a trailer hitch and a wagon to carry on behind the vehicle is something new as it would provide more storage space as compared to a roof box. The trailer hitch is particularly acceptable because of the height restriction at certain parking lot in the country. Well that is next on the wish list.