Thank you for mentioning Hendrix ! Zeppelin is amazing. You can't put them at the top though, 2 many out there... I always think of what would be of rock if those bands didn't stop or die. Think of Jimi Hendrix being alive. Jim Morrison. Kurt Cobain. Music would be different. You never know what would be. But what is; is that Zeppelin were great but not #1, there is no #1.
I don't know if I'd call them the BEST rock band in the world, but when I listen to them my face usually ends up completely melted off. One of my favorite songs by them is Achilles Last Stand, the guitar solo in that one is crazy
They invented modern hard rock, Ill give em that. As far as being the best ever....I can think of better bands - Floyd for one.