I like the Roland bender okay...that's what's on my Jupiter 8, and I also like the pitch/mod wheels on my Yamahas...it's all in what you get used to.

I only tried the Korg briefly...it was a synth, a Triton I believe...a joystick type affair that seemed pretty decent as well.

I had a big old Yamaha CS-80 synthesizer that I had restored and then sold to a collector...it had a horizontal strip just above the keys that let you bend pitch....the center was always where you first put your finger...you could do trills, flutters, and all kinds of tricks with it....it had a sort of felt-like covering; very cool.

I favour the mod wheel because it can remain where you pushed it, especially nice for activating the Leslie speed on the Tyros3 and S910.