Like I stated, I bought a new Super for a desktop controller. My Primal Rage JAMMA cabinet came with used Competitions, and my Neo-Geo cabinet came with used Ultimates.
The ultimates feel flimsy and unresponsive. Spring pressure is weak and the throw seems greater than the others. When you roll the stick, you definitely "hit" the corners the hardest of the three. Still pretty smooth, though.
The competitions feel tight and responsive. You can feel the corners, but the stick rolls through them nicely for fighters. I have no real complaints with them at all.
The Super I have seems a bit stiff to me. Control is responsive and you can roll through the corners nicely with the round actuator. Comparing them, I prefer the slightly smaller, smooth handles on the Competition.