2 - strokes always "feel" faster, even if they aren't, no doubt about that.
This argument will never be settled because EVERYONE has seen some 4 strokes wax some Banshees, but they've also seen some Banshees (bolt on) wax some 4-strokes. If both are equal riders, with both engines in a good state of tune with correct gearing, tires ,etc.; I believe the Banshee will always win.
BUT what you see alot of times is bad riders (most common), bad state of tune, wrong gearing, wrong tires, etc, on some of these that makes the race favor one or the other. Just my experience.