Repo Question (Regarding Ubuntu 14.04 -Trusty Tahr )

Hi, 

I want to install Ajenti on Ubuntu 14.04. The installation KB article about mentions two different repository links however.
The quick auto install script adds http://repo.ajenti.org/debian as a source and the manual install adds http://repo.ajenti.org/ng/debian. 
NG sounds like next gen to me. What is the difference and which one should i prefer on Ubuntu 14.04?

Thanks
Adrian