The reason I use Prismacolor pencils is because you can blend them on illustration paper, and I find that incredibly useful to achieve the kinds of shades that I want. But the thing that makes them blendable also causes a thing called "wax bloom" which can happen several months after the picture is finished. Basically, think of all of the incredibly bright colors being hidden under a haze of white wax that you have to scrape off in order to restore the vibrant colors. If you can finish your picture in fast enough time, you can treat the picture so that the bloom never happens, but you need to be diligent and fast and not set the picture aside for a while, i.e., you can't really take a break from it.
I also use Prismacolor pencils because you can clean up the mess really easy with a vacuum. You simply cannot say the same thing about paint. Anyway, if you have the time, watch the video. This person's process in making the Pennywise drawing is impressive and kind of mesmerizing.