Interestingly enough, neither of the planes you've selected are really considered 3D planes. The Formosa is very agile and is designed for pattern-style aerobatics while the Super Chipmunk is designed more for scale aerobatics.

3D flying usually involves a lot of high-alpha "nose up" manuevers and hovering the plane by the propeller rather than flying on the wing. It requires a 1:1 or better power to weight ratio and very large control surfaces to hold the plane in position while it's hovering.

Both the Formosa and the Super Chipmunk would be very manuverable, however, and a lot of fun to fly. Get them both if you've got the cash.