I notice you show as a "Solution Partner" rather than an end user. Which company are you with and what is your interest -- maybe I can help more with that background. But in brief:
1. SolidWorks includes the ability to do basic mold design in their higher end bundles. Same thing for Solid Edge. This includes sweeping a parting line (which works on simple parts) and tools for manually closing shutoffs and so on. Solid Edge even has an "isocline" function directly in Solid Edge Classic. So I would say you can mostly compare SE and SW heads up for "basic" mold design.
2. The Solid Edge add-on is MUCH more sophisticated. It has extensive control over the parting line generation, which is what is really needed in "real" mold conditions. It has a whole electrode generation capability and much more.
So its really a question of what the user wants/needs. I think SE stacks up favorably in both situations.