That I'm afraid is totally up to personal taste ! It depends what you listen to generally
, pop, folk, jazz, blues, soul, classical...
Bluegrass has a bit of all that in it, and each individual artist has chosen to bring out more of one or several of these in their particular style of bluegrass:
Tim O'Brien's fairly recent career has a lot to do with his exploration of the Celtic & Irish roots of bluegrass music
Tony Rice's style of guitar playing brings out the blues in bluegrass I think
Bela Fleck's banjo is highly experimental, skillful and close to jazz in many ways
Alison Krauss recent career has veered towards more mainstream, popular music
Chris Thile's mandolin is in the bit in the same vein as Bela's banjo, but with classical music influences as well
Third Time Out (if they still exist as a band, I don't know) is very much the gospel roots of bluegrass
Peter Rowan carries with him quite a big folk & 60's hippie's music (he had a band, Old & In The Way, with David Grisman and Jerry Garcia , the late lead guitarist of the grateful dead) tradition
The Del McCoury Band are a good example of modern day bluegrass quite close to Bill Monroe's original style
The New Grass Revival were pioneers in the broadening of bluegrass towards the music of their generation, rock, blues, jazz, experimental....
I hope this is a bit of useful insight
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