When comparing Solarized Dark vs Moka, the Slant community recommends Moka for most people. In the question“What are the best Gnome Shell themes?” Moka is ranked 4th while Solarized Dark is ranked 9th. The most important reason people chose Moka is:
Moka offers suers easy to follow instructions to download including PPA's for Ubuntu based distros and Fedora specific instructions to install its repo.
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Pros
Pro There are versions for a lot of applications or it's easy to make your own
There are ready-made packages for Vim, IntelliJ, Emacs, iTerm, etc. If your app isn't supported the website explains clearly what colors are used, so it should be easy to wrap up your own.
Pro It seems that is has been given the most thought
Judging from the description that has been given by the author, it seems that this color scheme has been designed with huge background knowledge about colors and relations between them.
Pro Works well with multiple fonts
Since Solarized has pretty good color separation it's easier to distinguish both thin and bold fonts.
Pro Several distro specific instruction to download
Moka offers suers easy to follow instructions to download including PPA's for Ubuntu based distros and Fedora specific instructions to install its repo.
Pro Wide support
Besides this Gnome Shell theme there are multiple GTK and icon themes that match, giving the user a wide variety of themes to mix and match that still look great together.
Cons
Con Too much blue
People caring about the color intensity in their screens, will notice that this theme is not useful for night use. If you use software like Flux to dim the blues in your screen this theme loses its enchant.
Con Low contrast
Comments for example, have very low contrast against the background which makes it harder to read.
Con Vanilla version doesn't work with htop
Half of the usernames in htop have the same color as the background.
One has to use a patched version of htop.
Con Does not work on older version of Gnome Shell
Moka does not work on Ubuntu 12.04 nor will it work on Debian Wheezy as they both use old version of Gnome Shell.
