The battle of the 1974 classics.
Both films in ONE way or another helped influence or redefine the slasher genre. Black Christmas was a basis for John Carpenter for Halloween, and Texas Chain Saw ... well, I don't think I have to explain that one.
Which one do you prefer/think is the better film?
I take Black Christmas myself. For some reason, I find that to be a creepier film than TCM.