I'm afraid that this is also a bit of urban legend but to some extent has a grain of truth.

Both systems are easily capable of pushing a wing to the point of stalling in a loop or very tight turn if they have enough throw. So one is not really more manueverable than the other if you look at it that way.

While it doesn't seem like a stabilator is moving much the angle of attack change overall is roughly the same to get teh same elevator response. But the movement of the elevator needed to give the stabilizer/elevator combo the same angle of attack change is more noticable.

Stabilators will actually stall at a lower angle of attack change than the traditional stabilizer/elevator. All else being equal an airfoil with higher camber will stall later. So a conventional setup can often generate the same pitch force while producing less drag to do so.

However for smaller travel angles and minor trim changes you're right and the stabilator will have somewhat less drag for a number of reasons. But for higher angles of deflection the crossover where the conventional setup is actually better is soon reached.