Of fanzines of most interest to the people posting here, I'd say TRUMPET, PHOTON and the mimeographed CINEFANTASTIQUE were my favorites. What was the one Scot Holton and Bob Skotak worked on? That was great, too. So was FXRH.
If you cross the border into science fiction fanzines on the one hand and comic book fanzines on the other, there are just too many good ones to try to make a reasonable list, at least out of my erratic memory.