Maybe a little bit better in term of no sounds drop of or a bit delay when doing quick chord changes, I feel there’s slight delay with SD9, Sd7, it could have been just me. Also I prefer the live control panel of Audya better, I feel the same with control panel of PA4X. As for the sounds and styles, even though Audya has more styles, the SD9 styles sounds really good. All in all, I’m just used to the Audya, but it’s old, eventually might have to play with other KETRON, not really sure if I answer your question