When comparing Iris Light vs XGnome Enhanced , the Slant community recommends XGnome Enhanced for most people. In the question“What are the best gtk3 themes?” XGnome Enhanced is ranked 12th while Iris Light is ranked 25th. The most important reason people chose XGnome Enhanced is:
XGnome Enhanced supports Gnome Shell versions going all the way back to Gnome Shell 3.6.
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Pros
Pro Multi GTK support
Iris supports newer versions of GTK3 (3.10) and also GTK2.
Pro Supports many versions of Gnome Shell
XGnome Enhanced supports Gnome Shell versions going all the way back to Gnome Shell 3.6.
Pro Offers PPA for easy install on Ubuntu
There is an optional PPA for easy install on Ubuntu.
sudo add-apt-repository ppa:noobslab/themes && sudo apt-get update && sudo apt-get install xgnome-enhanced-gs
Pro Designed to be modern and minimal
The XGnome Enhanced theme is deigned to be modern and minimal. It is a very dark theme with clean lines.
Cons
Con Development not finished
Iris is still in beta so there may still be bugs and other glitches.
Con PPA does not work
For example, you'd get errors like "Unable to locate package xgnome-enhanced-gs."