Here is my 1 1/2 cent......
To answer which is the best sound........Just get all of them........each KB has a sound that you'll like that other one don't have. Also it makes the music comes more alive anyway. I use a X1, yamaha, roland and I even still use the R-8 roland drum machine. Maybe, I'm just strange, but I think it different sound from different board it makes it sound more alive........that is just my opinion........
Just want to say "HI" to all the friends in here..........