Can anyone explain the main differences between the three types? Not how they look but how they fly and why a certain type is preferred over the other.

I see most profiles are modeled after scale aircraft and most full-scale aerobatics are done with Extras/Edges/SU-29s/Yaks, etc. What sets those designs apart from a pattern aircraft and why are there no full-scale pattern aircraft?

Thanks, just trying to figure all this stuff out