LINUX Mint
My personal favorite
LINUX Elementary
Great Interface - Looks like a MAC
LINUX Kubuntu
High-end effects and plenty of eye candy
LINUX Mageia
Classic Menu Structure
LINUX Zorin
Looks like Windows XP & 7
LINUX Ubuntu Studio
Artists, Musicians, Photographers, Video Editors
LINUX Fedora
Enterprise version for small business
LINUX Ubuntu
Most installations worldwide - used on Android & TVs
LINUX Operating Systems 
Linux flavors - simple barebones to decadent desktops