Ubuntu's Unity interface is gone, which means there's one less desktop to choose from in Linux-land. And while dozens remain to choose from, Unity was one of the most polished out there. Many will miss its detail and design.
One of the desktops that is nearly as well polished, and therefore worth Unity fans considering, is the not-quite-as-new-kid on the block, Elementary OS [theregister.co.uk].
Elementary OS actually began in 2011 as a theme for Ubuntu. It has evolved well beyond that now, with its own homegrown desktop environment dubbed Pantheon, 13 custom apps, and a distinct and very nice set of custom icons and themes. Under the hood it's still very much Ubuntu/Debian, so all the commands and basic apps you're used to will be there, even if you have to install them yourself. The Ubuntu/Debian underpinning also means you get the security and stability of those projects.
I've tested Elementary OS quite a bit over the last few years and I can say that, if you were put off by the bugginess of early releases, it's worth another look. The latest release, called Loki, has been very stable in my testing and features some really nice homegrown apps. The Elementary OS team is very good at getting the core of an app right and then polishing up the details over time.
Awesome. I really miss how Unity would slow my desktop to a crawl.