I have complete sets of both regular Prismacolor pencils and the Verithin. They are designed for two different purposes. The Verithins are hard and used for drawing and sharp detail. The regular pencils are for colouring. I never use my Verithins and am sorry that I wasted my money on them, because I only use pencils for colouring and shading. For more info, go to their website
www.sanford.com
The regular Prismacolor pencils are artist grade pencils. Crayola pencil crayons are student grade, so what brand you buy depends on how picky you are about quality. I love Prismacolors because they are soft and blend so nicely, but I know some artists who hate them. Because of that softness, they are difficult to sharpen. I'm told it's the high wax content.
Other brands of superior-quality pencils that I like to use are Schwan Sabilo Softcolor and Schwan Stabilo Carbothello (sharpenable chalk in a stick) and Faber-Castell Polychromos. The Faber-Castells come in the most amazing neutral colours.
Hope that helps,
just call me the Pencil Crayon Queen