Riki,
I currently own the Tyros 4, Ketron SD7, and the Korg PA4X. In the past I have owned the PSR 3000, Tyros 3, S950, PA900, PA1X, Pa2X Pro, Rolands E50 and E80 and the MicroArranger. Without any hesitation I will tell you NONE of these arrangers have the styles for Christmas music that even comes close to the Yamaha arrangers - NONE!

I am not saying I think any of these arrangers are better than the others - only addressing the questions here about Christmas music styles.

Deane