What's the best version of "Porgy and Bess"? Instrumental and Sung?

I heard the Louie and Ella version isn't all that great. What's the definitive version?

I would first listen to the original Gershwin arrangements. He wrote the music, so the definitive version would have to be his. My favorite version is Miles Davis.

Gershwin or Miles Davis

Marian Anderson on vocal backed by ANYBODY.

Ella Fitzgerald and Louis Armstrong...

Yeah, I gotta go Ella and Satchmo

Which number? Billie Holiday did some good ones:

My man's gone now
Summertime

I like Nina Simone's version.