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Zeppelin and U2 alternate positions at one and two of my top ten favorite bands, but I don't think any of led zeppelin's albums are in my top ten. Probably in the ten to twenty range you'd find more than one of their albums but not the top ten. I think Physical Graffiti is most likely my favorite Zeppelin album, but I'd have to spend a little time in thought before I made such a commitment.
I think their 4th album (that's the one that people mistakenly call "Zoso," right) is my favorite, but you know I'm not really an album listener, so my opinion on albums is a) not particularly worth considering, and 2) subject to change at a moment's notice.