Fender clean is indeed the best. I have an old 64 Super Reverb that is as sweet and glassy as they get. I think 60s Blackface is the best clean followed closely by Fender Hot Rod clean. The Bassman is a little warmer and has more texture to it. Revelation: Mesa clean channels are essentially a 60s Blackface Princeton circuit so they do clean very well too. Vox AC 30 (The Beatles) clean tone is excellent but different than Fender clean.
So many amps, so little time.