I would recommend doing songs that YOU like. Since I have to listen to them over and over and over and over again, I like rarer more obscure songs... For instance, last year I did Brazilian Sleighbells by Ferrante and Teicher. I also did an instrumental Brian Setzer cut that was only sold in Japan.
I'm struggling this year to find something that I like enough to add in my show. I gave Wizards in Winter a rest last year only b/c I added lots of RGB last year and didn't have time to sequence the way I wanted.
It's just personal taste. Have fun with it.
If my radio boss wouldn't kill me, I would share the artists and songs of our Christmas library as we do have a lot of rare big band and older stuff that people like but the other Christmas stations don't play.