Should I get a minor or a certificate?

So I’m majoring in Resource Conservation and Media Arts. I’m thinking about going to graduate school for Landscape Architecture or Urban and Regional Planning so that I could use the design skills from Media Arts and the environmental/conservation skills from Resource Conservation together. Eventually I would like to start my own business. Would it be better to get a minor in business or a certificate in GIS?

The certificate in GIS. It teaches you a concrete skill that you could deploy in the field that you’re interested in.