@_its_not_real_ RTs are things that make me laugh, things that are pretty / cute, things that I find interesting, things that I care about. Likes just mean "thanks for the tweet" which can be for many reasons.
@_its_not_real_ Sometimes I'd like to QT with a comment, but the tweet has media or is a QT that needs the original to make sense, so I RT and then reply with my thought.