RE: Help me decide
If your looking for no 3D, solid precision aerobatics....seriously check out the Seagull Extra EP. It will do 3D if you get on it, but it absolutly excels at smooth precise maneuvers. Its often overlooked, but is still a really good aerobatic plane. Drop a park 480 or Extreme Flight 2818/900 on a 12x6 prop and go for it. Just reinforce the horizontal stab before you fly it.
The SebArt Katana is more of a 3D plane vs precision aerobatics. Its a little too floaty for the precise stuff in my opinion. But if you want all out 3D mayhem...the katana is the plane to do it.
The EF Extra is also a good general aerobatic plane, but Id HIGHLY recommend reinforcing the horizontal stab on it also. Both the seagull and the EF extra have paper thin stabs, and you can fold em in a hard pull.