I would say Genos. I played the Genos on multiple occassions and every time i see one i play it, i've played the Korg PA4x on one occassion for about 30 minutes and was glad i could take a seat behind a Genos again.

Some of the sounds i would say the Pa4X wins, electric guitars, organs. But most of them the SA and SA2 sounds blow it out of the water.

Styles? That's a no brainer, sorry but what was Korg thinking with the styles? Most of them are blatant song styles, some of them sound like they were blatant midi conversions, and there were a few really good ones, but also a couple that i wouldn't even want on a Casio.. So that's a mixed bag.

It's weird, where Yamaha makes a keyboard with 550 styles and roughly 530 are useable and sound REALLY GOOD. Korg makes a keyboard with 400 styles and make about 40 sound really good.

Casio does that as well, 280 rythms on the MZ-X500 right? I would say that maybe 30? Sound presentable.