I think update schedule should be dictated by content. If your comic is a joke strip without continuity, daily or something close to it is probably the best sort of schedule for a comic like that. People want little nibbles of content, often from a comic like this.
On the other hand, if your comic is pulling from graphic novels and manga, trying to tell a long format story, I believe that a weekly update with more than one page is a better idea. As a reader, I know I prefer to read multiple pages at once if I care about the story. Daily updates for an ongoing story tend to fatigue me and make me start putting reading the updated off because I know that very little is going to happen each day.