Is there an actual advantage to BBP vs SBP?

I have a 67 Barracuda and recently did the later style disc brake swap up from giving me two different bolt patterns. While knowing this kind of drives me crazy I was planning on running factory style steel wheels in a 15x8 on the rear. Wheel Vintiques offers these rims in a SBP. Not converting would save me the cost of new axles and the 10x2.5 or 11x2.5 drum setups and could be utilized to purchase a much needed suregrip.

Looking for any advice as to if there are advantages to the swap other then the larger drums and increases wheel selection.

Thanks