Im building my first giant scale 3D airplane and Iv been trying to do some research on the rudder setup. What I want to know is if a pull pull system using 3 servoes and a bell crank is better or worse then a push pull system with 2 of the same strengthservoes in the back of the airplane??? Also I have really only seen the 3 servo set up, so is a push pull even legal for IMAC?

Thanks