My vote was for Cell-Shaded, only because I don't mind waiting (an unpopular opinion, I'm aware), and prefer quality over quantity. Furthermore, there are some artists who've produced just flat B&W/Screentoned stuff, and it's a mess. It doesn't seem like that's the setup we'd run into here, given the usual quality of your work, but to me it's a concern. Having to squint and twist your head to figure out how the layers go together in a badly composed comic is problematic and frustrating, so I prefer to avoid it altogether with colored content.
All that said, between the quality of your work and what Thorvrog is suggesting, I think it makes a lot of sense.
I voted for cell shaded. I'm a patient man who appreciates quality. However, I'm also aware that when you have fans expecting something, leaving them waiting can be frustrating or, in some cases, unpleasant.
Cripes, am I aware of that second part.
So yeah, it's probably more prudent to evaluate the demands of the comic you're about to draw. If it's something simple and short, the effort involved with the cell shaded style might be less daunting. Something more lengthy? I'd do the screen tones. Also ask what would suit the comic more. There are some stories I think might work better in black and white than others. It can be a stylistic choice as well.
I concur with Thorvrog. For short comics, cel-shaded would be appropriate, but longer, more involved comics should be screentoned to make production time shorter (unless you're going for that MSPA look, I guess).
Yeah, because in a way then the workload is even out. Since it's shorter you can add more details without spending far too much time - dependant on your drawing speed - and for the longer ones simplify it a bit to cope with the quantity. After all, mostly comics are kept up by the story, so a downgrade in quality is usually accepted for the story.
Another thing you could do for the very long ones, like almost thirty pages long, is to have the first three or five pages to set the story up be cell-shaded, and then the others be Screentoned again, like a Manga. Could be a way to draw in more attention and readers to the comic. Just food for the mind.