Having no opinion entering the thread and reading what more experienced people have said, I would go with a lesser. You're asking from an investment stand point and the lessers do the same things as butters for less. Lessers are generally from ~$275-$350 and butters are ~$350-$450, from websites like kingsnake and faunaclassifieds. Also the lesser seems to be more common where as a butter just seems like an advertising gimmick to sell the same snakes for more.