aramis,

Don't You read what we have told You?! ;-?

Have You ever heard the expression: "The beauty is in the eyes of the beholder."?

The same is with sound. Although both Yamaha S900 and Roland E-60 have excellent voices, some people prefers Yamaha, while other prefers Roland.

There is no sense in making Your own decision by following others choices. Because, You might get conclusion that majority of people here prefers keyboard X, and then You buy it, and after some time You come to conclusion that keyboard Y sounds waaaaaay better.

The best answer You can get is to search for the sound demos on the internet (You have lots of audio demos and some videos).