Rolling releases are popular because people got sick of waiting two years to upgrade their distro and get the new version of some Linux app, because one version of a distro keeps the same old version of the Linux apps forever (in the stable tree). unstable and testing branches have newer releases, but as the name implies, it breaks quite a bit.
So rolling releases are like an unstable/testing branch, with more effort put into keeping it from breaking. So you get new software all the time. The downside is, you also don't get to opt-out of an upgrade, which can be pretty painful when the upgrade breaks something you're used to.
Rolling releases are popular because people got sick of waiting two years to upgrade their distro and get the new version of some Linux app, because one version of a distro keeps the same old version of the Linux apps forever (in the stable tree). unstable and testing branches have newer releases, but as the name implies, it breaks quite a bit.
So rolling releases are like an unstable/testing branch, with more effort put into keeping it from breaking. So you get new software all the time. The downside is, you also don't get to opt-out of an upgrade, which can be pretty painful when the upgrade breaks something you're used to.