I haven't tried many Christmas-specific blends, but of the ones I have, I kind of have to give it to this year's C&D We Three Kings.
Many I have tried I wouldn't even say are necessarily all that evocative of Christmas or even winter in general. The Cringle Flake i have tried was just a va/or with perique for example, and while not bad, didn't exactly say "wintertime", nothing about it made it more wintery than any other va/or or va/or with perique, it wasn't even "warming" or all that "plummy", I never understood why it was a Christmas blend to be honest, like what about it made it Christmas other than just being released at Christmas time.