I haven't been to OshKosh (on the bucked list though), but I have been to Sun -n -Fun and I can tell you that it is just fantastic. They had planes to drool over all over the place, Trikes galore in the light sport/ultralight area, tons of cool gear from every manufacturer you can think of, air shows happening all day long, food! airplanes! trikes! gyros! great weather! Local fly-ins are also great and you won't meet nicer people, you should attend one sometime! In the end they are all great activities!!... why limit yourself?