I suggest you just pick which person you want to describe first then start comparing him to one or the other then do the same for contrast.
Answer:
it always depends on what kind of behavior you are showing, sometimes there's bad behavior that needed to be fix and there's a good behavior that needed to be consistent. so you must good care of your dark side and good side. You must take care of your attitude
Informal language is often used when we speak or write. It is a lot different then formal language. For instance aint is informal language.