@KaseyTheGolden embracing mistakes was a big thing for me too. I feel like a lot of my digital art looks "stiff" from overworking, compared to my traditional stuff.
@franzvanderlinde I think in terms of speed, you're going to be fastest at the one you like best, or at least, the most motivated to finish. I tried switching to digital a couple years ago and eventually, I realized I just didn't enjoy the experience of making art as much in digital to really "learn" it. I didn't love the endless fiddling it prompted, and sometimes, I think using watercolor is actually faster, since you can get a lot of cool effects from the way the paint naturally behaves, rather than spending hours adjusting gradients. They're just different.
I make all my art traditionally. My comic is all done with watercolor, with the linework in dip pen and india ink. I do a small amount of "tweaking" in Krita when I lay out the panels for tapas and webtoon. I can get rid of a few unsightly paint splatters that way. 
I also do all of my lettering/balloons digitally, because I don't like the look of my printing AT ALL. My cursive is okay, but no one wants to read a comic in cursive. 
I do like being able to blend aspects of the digital into my traditional art, but for now, I'm glad I've stuck to trad, because I love doing it and that motivates me to learn/get better/make the comic.
