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
You could use wheel adapters. Now u gota have two spare tires.