Instagram celebrates your personal moment, giving your pictures a zing and digital filter making it a picture perfect and making it easy to share on various social networking sites. Pinterest is all about aspiration value. Pinterest is where curation (gathering, organizing and online presentation of content related to a particular theme or topic) happens. Similar to a search engine, users can use Pinterest to search for specific content or products. They can then create visually appealing boards by pinning and grouping the content they discover.
Pinterest has most Female users while Instagram is more about Gen-Next and have both male and female users. And when it comes to use of these two for branding, Pinterest Test Promoted Pins are useful to drive traffic to your website, whereas Instagram Drive sales with contests and promo codes.