longevity of OCP ink / Precision Colors?

I suppose you are using a pigment printer, as longevity is a must for you. Then pigment inks of both brands are OK. Dye ink is something you must be careful. I have used OCP CLI-8 ink in my Canon MX850 and OCP K3 pigment in my Epson Pro 3800. I have made exact the same print with corresponding profiles on the same type of photo paper (microporous). 5 months later (prints have been facing the window, during spring, summer and now autumn) and the dye ink of OCP has been bleached out significantly, whereas the pigment ink print is just as good as freshly printed.

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Crazy about printing, profiling and refilling printer cartridges