Green certainly had a moment, but you can't compare his work with the body of work that Clapton has created. I saw Peter Green about 5 years ago, he truly sucked, and had a hot Texan guitarist with him to keep any energy on stage. I went to see him because I respected his earlier works _ he wrote Black Magic Woman, that Santana borrowed. Fleetwood Mac, when they were a blues band, had some great Peter Green stuff - Bare Trees Album.
Clapton can still play with a lot of performance energy. What made him the monster guitarist, in my opinion, was the extended soloing allowed by Creams' music. There is nothing previous to Cream in rock LP's that allowed for such lengthly jam forms with guitar as the lead instrument, you can compare it to Coltrane, or Miles in it's extended virtuosity, but not content. Wasn't "Spoonful" the whole side of an album? Maybe Zappa's King Kong variations predates Cream, but the guitar wasn't the only focus of that jam.
Clapton / Hendrix discussion: when I was a kid, that topic took up many nights of conversation while hanging on street corners, when the girls weren't around. Was like Ali/ Frazier, who was better. Blow by blow, head cuttin' time, .. ... I take Hendrix.