In my opinion, the style in Audya sounds a little better, more dynamic. SD 90 is fun to work with, it is only the imagination that puts a stop to what you can do with that module. I have installed AjamSonic's SD disk with Stylepack 1,2,3 and Country pack, and new voices. Sounds good, has also installed Audya style vol. 1-10 converted to SD 90, so I have everything in one place. I'm thinking of selling Audya, now that I have everything in SD 90.