The bulk of the designs have the standard 18 x 3 wing which ends up with about 51-52 square inches of wing area when the tips are shaped. These don't stunt much at all.
Four designs, the Golden Hawk, Stuntmaster, Cyclone, and Bullet have about 74 square inches and win most of the stunt events.
The Speed event, a least around here, is always won with a speed of about 63 MPH. Surprizingly, the 52 and 74 square inch designs can both hit this speed with a healthy engine. Empircal data shows that a smaller wing does not yield higher speed in this speed range.
There are quite a few odd ball designs that don't fit either of the above: biplanes, the triplane, the B-66, and the missles. I'm fiddling with a biplane to try and make it stunt, but otherwise, these are only good for the Craftmanship event.
And of course, the F-82 Twin Mustang, which, if you overcome the 2-engine challenge, can dominate Speed.