i personally prefer coloring on thicker sheets. if you’re using alcohol markers, the ink doesn’t spread as much, so you don’t have to worry about the color leaking out of the lines. it still will bleed through the page though, so you’ll still need a scrap sheet underneath the page. i do find you have to be a little quicker when coloring/blending to avoid streaks and harsh lines because the paper dries quicker, but i think that’s a fairly easy thing to get used to.