If you haven’t used any other desktop environment except Unity under Ubuntu 16.04, there are many choices that you can try. Since Linux offers the possibility to test many desktop environments, you can choose your favorite one from the list given below.
1. Gnome 3
sudo add-apt-repository ppa:gnome3-team/gnome3-staging
sudo add-apt-repository ppa:gnome3-team/gnome3
sudo apt update