I'd recommend giving them both some dirty cocaine or at the very least some Sanatogen to pep-em up before I'd sit and listen again.
That's what probably f***ed him up in the 1970s...well perhaps not the Sanatogen.
Clapton was at his best when he was trying to establish and proove himself. Once he had achieved 'God' status and had money/drugs etc. he definitely lost an edge from his playing. Also as has been mentioned in another thread when he was in Cream he had to work with two talented musicians and couldn't afford to sit on his arse like he sometimes seems to do now.
I read recently that Jim Marshall still has a letter from Clapton in the 60's apologising that he had fallen behind on his HP payments on his Marshall amp