I watched Omit the Logic last weekend, jeebus it was sad. Pryor was a little bit before my time so I knew the broad strokes of his life but I didn't really know all the details. He bared it all on stage though, I think Murphy is lighter but Pryor is poignant and probably more likeable.
Age can be the difference. I'm... old... and came up with Cosby, Redd Foxx and Pryor. Pryor to me as Carlin. He does more then make you laugh, he makes you think and feel. Murphy was the perfect smart mouth of the 80s. For me in the 70s, Pryor was the comedy act I almost had to hide from the folks to watch or listen to.