No pictures knocked off the wall. No scratched walls. No back breaking from lugging a whole tree. No wasting time with those giant and useless Christmas tree bags.
And best of all, less pine needles everywhere. While this isn't a big deal with Douglas Firs it is brutal with other species, say Colorado Spruce trees. Their needles are tiny evil daggers that get stuck in everything and make you want to scream when they get stuck in your sock. I know from experience.
Minimal hassle and supplies.