Not Sure What Type of Crystal Support to Pick? 

Yoni Eggs -- Are used internally, and are supportive for strengthening and softening pelvic tissues both energetically and physically. Because it is fully inserted, it is 'hands free' and gives more freedom in the type of practices one can do.

Yoni Wands-- Are mostly used as a de-amouring tool. They can be used both externally and internally for massage and extra grounding as you have one hand in contact with the wand. There is a lot more control in this practice. 

Yoni Orbs-- Are only used externally. They are an incredible tool for posterior massage of the pelvis. Deamouring externally the perineum and anal / rectal tissues.