When you start talking greatest ever (not most popular) it gets a little subjective when you are in the top ten or fifteen of most lists. I agree with you on Hendrix. An aficionado but his solos were not all that melodic, they were more racy. Buck Dharma of Blue Oyster Cult I much prefer. I, personally, think Deep Purple is just as great in some ways as Led Zeppelin. But here is where I meant it becomes a matter of taste when you are comparing elites. Too many great bands.
BTW, your response to Aaronland in post #15 was the best!