There's the answer!Matte is basically dull and flat. No reflective qualities at all. Satin is flat but has a slight gloss that reflects a little light. Not as much as a semi-gloss. But not as dull as matte.
Actually satin finishes are pretty easy to keep clean. Harley has been using them for several years. No need to wash. No need to wax. The best and proven way to clean it is with......are you ready??both look nice on a show car, both look like a PITA in real life, so not for me. But it's your ride, go the way that feels right to you and show us what it looks like!