When comparing Zukiwi vs Elegance Colors, the Slant community recommends Elegance Colors for most people. In the question“What are the best Gnome Shell themes?” Elegance Colors is ranked 11th while Zukiwi is ranked 13th. The most important reason people chose Elegance Colors is:
There is a PPA available for Ubuntu users, which makes installing a breeze. sudo add-apt-repository ppa:satyajit-happy/themes sudo apt-get update && sudo apt-get install gnome-shell-theme-elegance-colors
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Pros
Pro Offers PPA for easy install on Ubuntu based distros
Zukiwi offers an Ubuntu PPA for Ubuntu based distros.
sudo add-apt-repository ppa:noobslab/themes
sudo apt-get update
sudo apt-get install zukiwi
Pro Has matching GTK theme
Zukitwo Gnome Shell theme offers a matching GTK theme.
Pro PPA for Ubuntu
There is a PPA available for Ubuntu users, which makes installing a breeze.
sudo add-apt-repository ppa:satyajit-happy/themes
sudo apt-get update && sudo apt-get install gnome-shell-theme-elegance-colors
Pro Changes color
Elegance Colors can change it's Gnome Shell theme colors in accordance to the users GTK them, wallpaper or a user defined color.
Cons
Con Only supports latest release of Gnome Shell and GTK
Zukiwi only supports the latest release of Gnome Shell and GTK.
Con Outdated
The theme project has been abandoned and there has been no activity for the past two years (the last commit was in May 2015).
Con More involved to set up than other themes
Users need to run a command to run a process in the background for the theme to work correctly, which may be more involved than what users are typically looking for in a theme.
Con Doesn't work
Doesn't install and doesn't work.