The Tyros styles have a more thick sound to them, like there is double the instruments being played, not much room for soloing or a place for vocals, very thick, which is not a bad thing but just an observatrion.
When I use the Korg arranger it seems my solos are at the top, they seem to blend or get lost in the Tyros styles.
The varations on the Korg doesn't seem to change that much from 1 to 4, I tend to use mostly 3 and 4 , on slow stuff with alot of build I will go through 1 to 4.
The Korg styles are more in your face, the Tyros are more of a wall of sound.
I did try the live drums but they were out for the PA80, the drums on the PA are great, you can make millions of adjustemnts with the drums so you can get as close to that polished Tyros sound as you want