I prefer the old version! I was a child in the 80s and Lion-o was my first love! I created many alternative tales about Thundera, a promised marriage between Lion-o and Princess Onšana (me, a thunderian jaguar), and many other beautiful things who a little girl can dream... I think I still love Lion-o enough to write some fanfics ... maybe be forever! *pisk*
What I like most about in old version is the reddish color of the eyes. My eyes can reach that color in sunlight, and it make me feel a ThunderCat too!
Regarding the new Lion-o... he's sexy, but is not 'my' Lion-o!