Should I swap '72 sbp discs to '73 bbp discs?

The only thing I can think of is the single piston calipers are a lot cheaper and easier to find if you need to replace them than the 4 piston. I think when I bought the single piston calipers, they were around $35.00 each and readily available at the parts store, but it took my cousin over a year to find a set of 4 piston calipers and they were over $200 each.