Funny, I formed almost the opposite opinions on the difference in styles between Korg PA80 and Yamaha. To me it seems the Yamaha styles are more simplistic and allow for more "playing" by the player. Most of the Korg PA80 styles were quite full of riffs and nuances, although the fills were nearly useless.
I did think the drum sounds on PA80 sound more real and live than the Yamahas, although Tyros is a big improvement over earlier PSRs.
DonM