For me it has to be "November Spawned A Monster". It's not that I find it fun to watch-- I don't, I usually think it's ghastly-- but what's massively appealing about the video, at least on a conceptual level, is that Morrissey deliberately placed himself in an environment which was 180 degrees opposed to nearly every other environment used in pop music videos. The obvious contrast is the desert versus-- well, whatever, a club, a concert stage in a studio with fireworks, ice machines, and Marshall stacks, weird CGI-scapes, city streets, shopping malls, sit-com sets, and God knows what else. But the more important point of contrast is that in the desert Morrissey is totally devoid of elements which lesser pop stars use to mask their own crapulence: costumes, props, other actors or bandmates, and most of all those awful background dancers. Even the editing, which is so artfully used by video directors to mask the deficiencies of the artists, doesn't really hide anything. Every shot is Morrissey, completely exposed, utterly and often comically nothing more than his own twisting dancing painfully awkward himself. Lady Gaga wouldn't have the guts (though she may have the balls).
In fact you can contrast "November" with "Ouija Board" on that very level: the latter is very much a traditional pop music video in the way it's constructed, and Morrissey gets to "hide", as it were, behind the props and stage-setting, the editing and the dramatic story. In "November" he is alone, beautifully alone, and to me this makes it one of the most honest videos ever made. Yes, I know there are lots of cinematic tricks used to give the piece color and interest-- the video would have been truly perfect had it been done in one uninterrupted take using a single camera on a tripod-- but basically it's as raw and real as you'll ever get in a narrative pop video.