It is a hard question to answer. I'd probably say Tyros II as well, from hearing demos. Don't know how that question can be answered though honestly, if you look at the situation that played itself out a few days ago. Tons of peoples' ears went right out the window because of the lengthy post explaining the fake procedure. Now everyone can talk about how this and this and that is simply impossible on a keyboard guitar, when at the time we had people saying they could definitely tell that Chet and Tommy's playing wasn't real guitar.
I'm not saying this to pour salt on wounds either....so don't take it that way. I'm merely pointing out the facts of what happened, to illistrate that opinions on what sounds best need to be made by the person doing the buying; because how can you trust the opinions of someone who says that this or that guitar is the most realistic, when even the real guitar isn't immediately noticed as being real?