Pull-pull is definitely superior to pushrods. Smooth Precise movement, no bowing, and less weight. The length of each side has no effect on elevator travel. If the cable is pulled 1 inch at one end it will pull 1 inch at the other. It makes no difference how long each cable is or whether they are the same. One could be 24 inches long and the other 2 inches.

The pull-pull elevator is a little difficult to install if you've never done one. You will need to put the upper elevator wires in some sort of sheath because they will rub on a former. I use the inside piece of a nyrod assm. Same for the right side of the rudder pull-pull.

Just my $.02