I have found two ways of modeling a Gimbal Expansion Joint:

1. "Zero Lenght Expansion Joints method". According to the Caesar Help this is used for Gimbal and Hinged Exp Joints and they are specified by means of the stiffnesses boxes.
2. By means of the expansion joint modeler which includes the gimbal and Hinged expansion joint in their library.

Can I use both methods in all cases? or Is there some kind of considerations in order to use one of them?

Thanks in advance