Guys,
I'm just starting to get into larger aircraft, and could use a little terminology help.
As I understand it, a pull-pull system for a rudder is where some type of wire cable or similar material is used to pull the rudder in each direction.
A push-pull system is where two stiff rods are used to pull the rudder, while at the SAME time push the rudder.
If this is correct, which system is more commonly used?

I'm also in the dilema of using dual elevator servos, as I hear they are hard to get tuned to operate in sync.
Thanks for any help fellas.