Without question the versions of No Quarter from Earl's Court '75 were the BEST. I don't remember the date, but I have one version (soundboard, of course) that Page's guitar just growls, Plant's vocals are wailing, JPJ's piano is magical and Bonzo was, well, Bonzo. A magical series of shows for sure!! I do also like the 6-23-77 version, but mine fades out in the middle, which loses some points with me.
Peace.