Is there an actual advantage to BBP vs SBP?

I go with BBP all of the time when i fix up these cars.
The SBP stuff is weaker, harder to find in good shape, more expensive when you do, and generally a pain in the ***.
The only time i would stay with SBP is if i was restoring a car to factory stock on a rare A-Body.
Wheel selection is a lot better with BBP, but you can get custom made wheels like you mentioned.
And, if you plan to run some healthy sized sticky tires and get good traction and you have an engine with a lot of torque, those shitty 7/16'' studs won't cut it for long.
Do yourself a favor and go to BBP all of the way around.
You will be money ahead in the long run..............
If SBP was so great, why did Chrysler go to BBP on their '73 and up A-Bodies with a small block and performance cars?
Because it was better, and cheaper.