I'll agree on lyrics and bassist, but dayum, I have to go with Plant on vocals, just by how his voice touched me. I don't know, he just does it for me more than Daltrey ever did. Guitarist is hard to pick, I admit, and I'd say they are pretty close. Zep's music just made me feel more than The Who's, but they are both kick-ass bands. I still love Zep more, though