I admitted my ignorance in my post. But whether or not my opinion is meaningless kind of depends on what the OP is really asking. You seem to only be interested in which band has the best "chops" but that doesn't mean that they are in the same league when it comes to song writing, innovation, popularity, staying power, mark in music etc.If all you know of Purple is that one riff/trope, your opinion is kinda meaningless. Question: just because kids today don’t hear Lester Young in Marvel comics movies, does that mean he was not a giant of jazz?
Rolling Stone's 500 Greatest Albums list has 5 Led Zeppelin albums on it. Guess how many Deep Purple albums. I'm not saying Rolling Stone is correct, I'm not saying Deep Purple didn't have chops, and I am giving Deep Purple the benefit of the doubt by admitting that if I grew up when they were making music I might feel differently, but it's pretty clear that the majority of people do not view them as being of equal musical significance. To me Led Zeppelin's music transcends the era they made music in, it still sounds unique and fresh, I personally don't feel that way about the admittedly limited amount of Deep Purple I have heard.