The are pretty much the same thing, just different names on them from the lines they were created from. It would be an insult if you called him a butter( BUT this is coming from my biased self because I own a very nice looking lesser)
Good thing I'm not calling him a butter From my understanding from reading the threads around here, lessers are from ralph davis and butters are a bell line thing. They appear to be hard to tell apart when young, but it becomes easier as they mature, right?