I use pull pull whenever possible. The long push rods are problematic and harder to secure from flexing, this gets the servo up in the radio compartment for ballast reasons (verses rear mounted servos with short push rods, and gives very positive control in both directions if set up properly. Make sure your servo arm hookups are the same width as the two attach points on the rudder (horn to horn). This keeps the system symmetrical and the cables tight throughout their travel. I also like to cross the lines as well.