I see a real advantage in using a DA sander. Some have a 3/8" or more oscillation, others have as low as 3/32". My guess is a larger oscillation is good for rough work and smaller for work on fine work.
They also seem to vary between 3" and 6" in diameter.
What is recommendation if you only can purchase one DA?
What is recommendation if you plan on purchasing two DA’s?
Are electric random orbital sanders as good as a DA for body and paint work?