Difference between 5 amp motor 208v 1 phase 60htz, compared to a 5 amp motor 208v 3 phase at 60htz any $ sav?

A three phase motor requires 3 separate 208 volt AC lines plus the neutral. A single phase motor only requires one 208 volt AC line plus the neutral. There are also two types of three phase connections: A three phase delta and a three phase "Y" hook-ups. Unless you have three phase input from the pole you can't hook up a three phase motor.