I realize some of you like artificial trees, but I'm a real tree guy. With that said, there are basically three choices: 1) artificial, 2) cut and 3) living trees for planting outdoors after the holidays. There are pros and cons of each choice.
Artificial Christmas trees are good for people with allergies, but the fragrance from real trees is hard to beat. Cut trees primarily come from farms that grow trees for that purpose, so there is not an environmental issue related to cutting down trees. The fact that toxic chemicals are used to grow many of these trees is the only concern.
Fraser fir and noble fir are the two most popular cut trees, but other varieties include Virginia pine, Afghan pine (Eldarica), Leyland cypress and Eastern red cedar. With the exception of Virginia pine, these all can be purchased as living trees and planted after the holidays. Leyland cypress should not be purchased at all anymore. It is in trouble from a fungal disease and dying out. Eldarica pine should only be planted in arid conditions. It is a desert plant.