Both sound really good. It's hard to make a comparison when they were not playing the same songs. But here is how my old ears see it.
Tenor Sax goes to Korg Pa2X
Big Band goes to Ketron Audya
Grand Piano goes to both because they are basically the same.
Salsa/Latin goes to Ketron Audya
This is just my opinion on what I heard. As we all know this isn't really a good way to do a comparison of any musical instrument. Either of these keyboards in the right hands would be wonderful I'm sure.