from a reader's POV, some canon is more equal than others.

Right. Well also Joss and ME always seemed very into allowing the viewer to take away the interpretation that they like. So Buffy's official story ending in Chosen, works for me in that way. Whether Joss want to then write a comic on how he think it would have continued or not, ultimately I don't include that as part of my tv viewing experience with Buffy

I mean writers involved with the show (Jane Espenson, Doug Petrie) have written Buffy comics, but did they count as canon for the tv show?