Is there an actual advantage to BBP vs SBP?

The larger bolt circle the pattern is, the stronger it is. This of course is splitting hairs on most street cars, but with higher power street and or race cars, the bigger bolt pattern is the way to go.

But as whitepunkonnitro correctly pointed out, the SBP is lighter, so if weight is an issue and you are not running a boat load of power, the SBP will suffice.