Conventional aerobatics rely on the aircraft using its wings to " fly" through the aerobatic maneuvers. While nearly all conventional aerobatics rely on full control during the flight, there are a few violent "departure" maneuvers, wherein the aircraft fully departs from controlled flight (eg. Lomcevak) & tumbles wildly through the sky. Additionally, in some particular cases conventional aerobatics are flown at considerable airspeed & the aircraft can be very lean, clean & faster than hell.

3D maneuvers very often rely on the aircraft literally hanging on their propellers, rather than the wings -- which at times are simply convenient platforms for hanging large controll surfaces from --- with the big controll surfaces acting more like thrust deflectors than flying surfaces. 3D is very wowee stuff, as it is well outside the norm of what folks see aircraft doing in daily flight.

3D planes are built very lightly, so that they have high thrust-weight ratios, thus permitting the helicopter-like ability to hang on the prop & maneuver in that condition. This light structure & very large control surfaces virtually prohibits high-speed flight -- in some cases the aircraft will literally tear themselves to pieces if flown too quickly.

Both are exciting to watch & to perform.