im gonna have to say the blood python. their colors are bad asssss and they get to be so thick its insane. i just think they are the strongest looking snakes around. but most of them are mean as hell so i guess you will always have pros and cons
id have to say Chameleons as for one I could keep. 2nd place, geckos.
If I could keep one I would keep: Saltwater Crocodile, scary *****, It can get you Anywhere, land water, and it can jump like it's body length out after you.