Should You Upgrade: OS X El Capitan

What is new and better in the new Mac operating system, OS X El Capitan? Should you upgrade? Dual Boot Mac OS X: https://larryjordan.com/articles/create-a-dual-boot-mac-os-x-system/ Working and not working applications: http://forums.macrumors.com/threads/os-x-el-capitan-working-not-working-apps.1890772/ Music made in GarageBand