Given both planes are the same, a 4 stroke will 3D better than a 2 stroke. The 4 stroke has much better throttle response and will swing a larger prop. The bigger prop will help throw more air over the surfaces and creating a slower flying, better manuvering 3D machine. It also mimicks a gas plane if you ever do make the jump to fly something real good. I have 3 planes on 2 strokes and 3 planes on 4 strokes for 3D nitro.