Profiles are by far the most poplar for learning 3D. Anyone who has flown a variety of fatties and slabs will tell you that. I designed the Edge 540 Profile 6 years ago to be exactly a "3D Trainer" and it has been widely popular for that use since then. We are in the third generation of the Edge profile and the latest includes fiberglass tubed fuselage, sheeted fuse, two-piece wings, and is available in kit and arf format.