Beatles and Zep are too much apples and oranges to even try to compare. Beatles were song writers first and foremost. For Zep the 'songs' were really pretty secondary - they were just the scaffolds to hang their sound painting on. But jf you asked me which I would miss more if I could never hear a track again, it would be Zeppelin. But in part that's probably because of how old I am. I wasn't quite old enough for the Beatles music to mean as much to me when I first heard it as Zeppelin's did. Heck, to my HS cohort, the second side of Abbey Road was definitely a statement the Beatles could play in the album rock genre if they put their mind to it, but to us they were playing catch-up to what we were already listening to on WABX. So there is no way to separate that personal history from an 'objective' analysis. But that said, I listen to a lot more classical music than either today.