RS31 is 30mm deep with 16-spoke front, R501-30 is 30mm deep with 20-spoke front. Even I'm fine on the 16-spoke ones, so a lightweight like Ed doesn't need the 20-spoke wheels. The minor advantage of the cheaper wheels (besides being cheap) is the conventional spokes, but as I've never broken a spoke on Shimano factory wheels, that's moot.
RS31 is 30mm deep with 16-spoke front, R501-30 is 30mm deep with 20-spoke front. Even I'm fine on the 16-spoke ones, so a lightweight like Ed doesn't need the 20-spoke wheels. The minor advantage of the cheaper wheels (besides being cheap) is the conventional spokes, but as I've never broken a spoke on Shimano factory wheels, that's moot.