True that Linux world is going through a rapid change. There are three types of Gnome based distros I see:
1. Distros which are using Gnome 3 as such
2. Distros which have Gnome 3 but have their own modification as well, like Unity in Ubuntu, Cinnamon in Linux Mint, etc.
3. Distros which still prefer Gnome 2 or Gnome 2 derivative like Linux Mint Mate, Scientific Linux.
Snowlinux 3 Crystal too