I personally play a variety of keyboards live depending on the situation, but I've been told by people who have heard me and/or played with me for a long time that I always sound like "me" no matter what I played. Of course I care about the quality of the sound as well as it's playability but equally I care about the environment I'll be in and what'll work best in terms of available stage room, transportation, will require the least on-site setup/takedown, and be the most reliable. And it has to sound great. Tyros, 9000Pro, Gigasampler... I'll take all three thanks.