Clean and Digital. While I love your pencil drawings and sketches, your style looks really fluid when done digitally (and your sense of color theory is quite stunning. Those pinks really stand out). Just my personal opinion. :shrugs:
Your comics really benefit from the clean look, makes it easier to read the pacing, identify characters. Keeps the flow, and lets my eyes run unhindered from panel to panel.
"Stray lines give your works soul." is what one of my art-teatchers said often, insisting we'd keep every line, smudge and coffee-stain. I'd have to agree when it comes to "single-panel" work or whatever you'd wish to call them. 'tho full head circles with crosses and other building-blocks are a pet peeve of mine, and should stay in scetches, not completed works. I like the unpolished look, but please tear down the scaffolding.
Both. I prefer the sketches 'cause it lets me figure out your method for crafting and breaks the illusion most clean digital artists have: they don't make mistakes or don't even put down a fleshed-out concept before they start.
Both! It depends on the picture, and on you! You're the artist I do love your sketchy pencils, they were what first drew me to your art, because that's what I'd like my own art to look! But... the clean way also works, because it gives a different feeling to the actual art! It feels a bit more defined, and when you have a complex work (such as your comics) it can be easier to tell what's going on. So I stick with both.