Having flown both I will say this. On a 3D type plane I prefer a 4stroke using glow. Replacing a .45-.50 two stroke with a Saito .82 made a better 3D plane IMHO. Throttle response was better being the main difference. The .82 had a shorter spool up time and made better torque on the low end. When you are hanging on the prop at eye level every second counts. Not saying it can't be done with a good two stroke. Just giving my preference.
David