Both depends,some arts, i just sketch directly on the pc for the easy of changing things, and most important undoing lol (already halt for a moment thinking to undo on pencil,lol) But sometimes i like the pencil feeling over paper, or i just sketch sth really messy and fast on paper and with the idea there do the final on pc.
Well, I go for both! As you say, it depends. They're both great and fun and they look good together. (depending on what you do with them i guess) They both deserve to be used and not abused! (not sure where that came from but it's true i think)