SBP or BBP?

I put this topic here and not the "Wheel and Tire" forum because I'm just looking for general information, not anything specific. I'm just wanting to know which is preferable, SBP or BBP? My Fish still has the stock wheels, so I'm assuming it is a SBP car. It is just a base model slant six 65 Fish, no real bells or whistles. Although I'm assuming there IS a horn. Don't know, haven't tried that one yet. But here's my questions: are there any benefits to keeping it SBP, or would I be better off if I switched it over to the BBP? Thanks in advance.