Hi!
I have both Audya and SD 90, and in my opinion Audya sounds better. Sounds more live. I have my Audya in the studio, and SD 90 at home. I bought USB pen 1-6 from Ketron with Audya styles for SD 90, and in my opinion they sound as good as Audya internal styles, even better than SD 90 internal styles.

/fozzie
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Ketron Audya-76, Ketron SD 90, Ketron SD1000, Korg PA5X, Yamaha Genos, Zoom R-24, Zoom H2n, Guitars, Amps, Band in a box 2023 audiophile, Ipad PRO with Auria and iConnect AUDIO4 interface, etc. etc.