if given a chance to run either cat5 or MM fiber, i would most definitely run fiber.
the reason for that is that cat5 is realistically capped at 100mb (i know there is a standard for gigabit over copper but that is EXTREMELY expensive as it is right now only available in high end core switches and the price delta between the fiber gigabit blade and copper gigabit blade is approx 50%) and fiber has no upper limit to speed.
so with fiber you can run 10/100/1000 mbps and probably higher with no additional wire costs.
as to the price delta with switches with fiber and those that can't might be 10-30%, factor in the cost of rerunning fiber in a year or 2 and it all evens out.
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