I like most christmas songs that were recorded by an entity that includes the word "Philharmonic" in its name...

The Charlie Brown Christmas album gets played a lot around here

And I like most of the Mannheim Steamroller versions because the first one came out the year my dad died (just before Christmas) and there are lots of memories attached to it.

I also like the Windham Hill series, and just about anything that is a Celtic variant of the old familiar carols.