A couple of weeks ago I took some raw chicken out of the freezer that had been vacuum sealed on January 7, 2007 (over a year ago).
After thawing, the quality seemed as good as fresh chicken.
FYI, my freezer is a small frostfree upright kept in the garage. The fowl was on the middle shelf and the freezer at the bottom registers right at 0º.
For any length of time, I'd recommend a vacuum sealer. For a few weeks - probably not much difference. BTW - I haven't had freezer burn on anything I've vacuum sealed. Before I purchased the Food Saver - all of my ziplock bags had ice crystals in them. With the food saver there may be some air pockets that retain moisture. But not enough to affect the product.
FWIW