i can understand a comparison between Hendrix and Zep but you can hardly class AC/DC in the same category, no matter how much you like them. They aren't even contemporary! Hendrix is late 60s/early 70s, Zep are 70s, AC/Dc are late 70s/early-to-mid 80s (yes I know theyre still going but old men in their late 40s and 50s strutting about on stage like they were 17 is embarassing, i certainly wouldnt do it, not for all the tea in China!
shoorly Pink Floyd or the Doors would have been more apt?
but to answer your question, much as I like Hendrix and Zep, I'd have to plump for Jimi. Given a bit more leeway I'd have gone for Mama Cass Elliott, because I prefer to make my own kind of music and sing my own special song
even if nobody else sings along...