Originally posted by carpet_killa
I have both, the Z-Speed is definately stronger but the Kawa is better made! especially on the groove they cut on the chassis to accomodate the long belt. Also Z-Speed is thicker.
If you have a good radio tray like 5 Star or Kawa, the stiffness issue shouldnt be a problem since they kind of work together to make the whole chassis strong.
Also keep in mind, the radio tray is criticial because if you get something which has less quality and all the holes dont line up then you will torque bend your chassis even though you have a stiff one! so keep that in mind!