Detached garage – exterior insulation worth it? Zone 6b – GreenBuildingAdvisor

Should I add insulated Zip board on two sides of detached garage while I have these sides stripped before vinyl siding? Do I run the risk of condensation and mold if I insulate all walls and create a vented attic? 

I feel like since I have the walls exposed, I should.. for some reason do it. But otherwise people say it is a waste of money and can get warm and moist air stuck inside that will condensate on tools making them rust when outside temperature suddenly drops. 

Most people around me have un-insulated garages that they just use for tool storage, but I was thinking of making it like a movie theater room or a gym space potentially in the future heated with a mini split.