I am not sure I can help you with your question but I will try. From an artist point of view, the Polychrome colored pencils are lightfast while the Prismacolor pencils are not. Also, Prismacolor pencils are wax based while Polychrome pencils are oil based. If you like to color by building lots of layer, the Prismacolor pencils may form what is called a wax bloom (a whitish haze) over time. Since the Polychrome colored pencils are not wax based, they may be heavily layered without the bloom problem. However, if you plan to color and dissolve with solvents, either pencil brand is a good choice as long as lightfastness is not a concern.
Smiles,
Stella
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