Tarp or cover for winter storage

While I don't use either I can tell you what I see at our storage facility. What I see, is of the people who use covers they are for the most part on the trailer or MH. They are not always cinched well and sometimes see billowing covers from the breeze/wind but they are for the most part covering the unit. Some are cinched nice and tight and appear to cause minimal abrasion, others not so tight and appear to move quite a bit but they are covering the unit. Tarps on the other hand I see many more flapping in the breeze, all on one side of the unit barely covering any of it, laying on the ground flapping in the breeze not covering anything except perhaps a tire where it has bunched up or blown up against a fence at the far end of the lot.
So while I don't use either I have certainly thought about it and have come to the conclusion that if I were to use one it would be a well fitting cover with plenty of cinch points