But anyway. So much for "summary". What is this, a recipe blog?
My experience of Prismacolor (early millenium version):
Very smooth, thick layers
Easier to make muddy, gross colours by accident - maybe that's just me
Ink has trouble with it
Pretty serious wax bloom over time
Slightly cheaper, but not by very much.
Everyone is like "oh, switch to oil based pencils - it's life changing!" So far I'm not feeling changed. For whatever reason, I was expecting something more similar to pastels. Or I was expecting pristine colour mixing. Something. Something that justifies a slightly higher price and FAR higher praise. Maybe I need to lower my standards. Or maybe I need to try it on construction paper. Or maybe I need to shoot for realism. I don't know. I wasn't staggered.
My initial experience of Polychromos:
Thinner, lighter, harder layers (surprise!)
I had a slightly easier time mixing "nice" colours
Can draw over it with ink!! (Nice!!)
No wax bloom to constantly wipe away (worth it)
Slightly more expensive, but not by very much.
Who is the winner? I don't know. Each one caters to their own art style. If you're into quick, vivid colours, go for Prisma (well, early millenium version anyway). If you're into gradual layering and mixed media applications, enjoy the Polychromos.
Have I missed out on anything here? Is there a special technique one or the other is good for that I might not know about? Let me know in the comments <3