I am installing a ceiling fan in a bathroom. Because I will be connecting from an existing circuit in the attic and it is best for me if I do a switch loop. I know how to do that, and I know that I must color the neutral (white wire) black at both ends and that the colored white must be used as the hot TO the switch, not from it to the fan. I was thinking of using 14/3 grounded (15 amp) and eliminating the need to color the white. That leaves a neutral wire unused. The only advantage I see in using a 3 wire is that the hot is red or black and will not be mistaken for a white like might happen by coloring the white with black.
Any thoughts? I know the wire is more expensive, but it is such a small run, it's not a big deal.