Mike, I was in attendance at that Hendrix show at Winterland in '68, and believe it or not he was better in '67! Both times he had the original Experience band, but in '67 he and they were on fire (no pun intended ;-). In '68, Jimi seemed somewhat bored, like he was currently treading water and ready to change direction. By the way, Bill Graham did early and late shows at Winterland, but once you were in for the first you could stay for the second, which I did.
Unfortunately I never saw Fairport Convention live, but Richard Thompson numerous times. His guitar tone live is SO fine, much, much more to my liking than that of Hendrix, who made his Strat sound like barbed wire played with a metal pick, or I imagine what it feels like to chew foil. I realize I am in the minority in that opinion! The best guitarists I've seen live are Ry Cooder, Al Anderson (NRBQ), Dave Edmunds, and Albert Lee.