Ubuntu Trusty Tahr: More Yawns, More Polish
If you're new to Linux or the Ubuntu Unity interface, the overall performance and polish will be all that matters. If you're still bothered by Unity's look and feel, be sure to try one of the other Ubuntu desktops. The interface integration and the other desktop interfaces have a really smooth integration with Ubuntu's execution. That will leave no doubt about why Ubuntu is a leading Linux distro.