The best way to freeze meat is to vacuum seal it, as air trapped in the packaging is what contributes to freezer burn. Given that, I always take meat out of the styrofoam trays and cling wrap, and at a minimum use a zip lock bag and work all of the air out before I seal it. If practicable I use my food saver. I try to prep meat before I freeze it (remove the membrane from ribs, and the fat cap from butts), and that way they are ready to go when I thaw them out for smokin' time. If I buy something that is already vacuum packed (cryovac ribs, brisket, whatever) it can go in the freezer as is, and I'll prep that before smoking.
This is what works for me.