Can a layman chime in?
Around 1972, my listening veered off completely into jazz, blues and soul, and all '70s rock passed me by. After Duane Allman died, I threw in the towel.
So I think of Led Zep as the #1 hard rock band the same way Yes is the #1 progressive rock band. ("Name one.")
I did see Zeppelin at Madison Square Garden in September 1970, and I thought they were terrible-- sloppy, bombastic, self-indulgent.
I played in a band with a drummer who thought Ian Paice was great, so I have respect for him. But the only Deep Purple I've ever heard is "Hush" (I bought the 45 when it was released) and "Smoke on the Water", of course, thanks to 14-year-olds in guitar stores everywhere.
As far as Bonham, I prefer the jazz players of the era -- Baker, Mitchell and Densmore -- and the unique Moon. But Bonham was essential to Zep, no doubt.
Just my opinions...