IF you really have the time to associate w/ it everyday then i say Tegu.....that being and Argentine, stay away from the columbians. Tegus are really smart and can be house trained like a cat if you have the time and patience to do it. Ive owned both and quite frankly savanah monitors are boring IMO....I have two large Argentine breeders that are very feeder aggressive but have extremely unique personalities, and when you are near them they look you dead in the eye...kinda freaky but cool. They are one of the only reptiles in the world that hibernate...get a Tegu if u got the time.