Ompare Mozarts 3rd Movement of Eine Kleine and Mozarts symphony no.40

Listen to the 3rd Movement of Mozartas Eine kleine Nachtmusic and the 3rd movement of Mozartas Symphony No. 40. Even though both are a?dancea? forms, and of classical structure, how are they different? Where would each be played? Why do you think Eine kleine Nachtmusic is one of Mozartas most popular works played today.