Well that depends. Either way, I've helped create both solutions in a collaborative process that includes strategists, developpers and content creators. Oh, and SEO experts too. From the client's points of view I have helped facilitate core values, user experience funnels and goals. Technically, my responsibilities include designing UI and frameworks with software such as Fireworks, Photoshop and Adobe XD. Responsive design approaches that considered content management systems include wordpress, drupal and of course intranets.