ORIGINAL: Silversurfer
Another great flying bipe is an Ultimate Pitts. Properly set up and designed, it will outfly both the Pitts and the Ultimate. Just ask Sean Tucker and Jim Leroy. You could always bring back the Weeks Solution with a few modifications for 3D. If you can't already tell, I have a love affair with aerobatic biplanes.
That MIGHT be true with full size, but with models, the roll coupling on a Pitts or an Ultimate Pitts is severe enough that it makes flying knife edge all but impossible! I don't know how you could ask Sean Tucker or Jim Leroy to compare an Ultimate to them, since it's pretty unlikely that either of them have flown an Ultimate! There was only ONE Ultimate 10-300 ever built!
The reason you see so many as models is that they fly fantastic especially in our size range. I've flown a LOT of different planes over 30 plus years of flying, and the best flying plane I've ever had was my Dave Patrick Ultimate! I've had lots of Pitts' over the years, but they are anything but precise, and always a handful on the ground!
Jim