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The main reason (for me and most) is the sustain you get from open chord voicings.

Most popular songs use four chords -- 1, 4, 5, m6 -- which on mandolin (and guitar) are the easy chords with...

There are also picking differences between Bluegrass and Classical.
Bluegrass - The most basic rule is down pick on the down beat and up pick on the up beat. It's not set in stone - Bill Monroe did...

Think he's asking about styles of mandolin playing.

Best advice I could give is to listen to a fair amount of each, on YouTube or elsewhere. I'll put in my 2¢, but I'll make some misstatements...