For me nothing beats A Christmas Carol with Alastair Sim.
My favorite version too.
I saw over the weekend for the first time the 1935 version starring Seymour Hicks on Amazon Prime. I was pleasantly surprised how good it was. Though it only ran an hour so they had to cut a lot of stuff out.
Not a lot of "great" Christmas movies out there but there are hundreds and hundreds of them. This time of year, I just have the wife put on whatever Hallmark type Christmas movie she wants to see and I'll sit through it. My only pet peeve is that many of those movies have the guys portrayed as complete jerks most of the time.