Phosphoric Ooze
Lime Green Pudding
The official strategy guide lists Chocobo as having higher final STR than Red Chocobo, but this spreadsheet suggests otherwise: https://docs.google.com/spreadsheet/ccc?key=0Apa6evZUmvfHdGJLSUd5RWpJUzdsSmZ4SEpKckR4R1E#gid=1
(I had forgotten the link to that spreadsheet, but it turned out to be easier to find than I thought.)
In any case, Chocobo (and Narasimha) are fine choices if you want to use them. Unless you plan to take on the hardest DLC fights or like to push for speed kills and/or super-fast farming methods, monster optimization in this game is more about style than substance.
So you think spreadsheet > official strategy guide?
It does state in the wiki that it's a better Commando than it's red counterpart, depending on the player's preferences.
Would you choose Chocobo or Narasimha?