SB is cheaper and ez-er as they have stock roller blocks and valve gear VS the BB retro fit is the first thing I learned.

pro for roller is no worry on the oil/zink,break-in for the cam,you can move the lifters around on the cam unlike a flat tappet.

I just pulled the SB roller cam from one engine and stuffed it right in another with defferent lifters this time with no break in worrys

cons for BB are bronze cam gear/high rate of wear,machine work to clearance roller lifters,adjustable rockers/PRs,higher spring pressures and maybe more machine work,more $ to reto fit,and lot of measureing and math

pro for BB is high performance,no break in worrys with oil, and mild to wild on cam selection

I am working that way for my BB,been roller cam in the SB since 07, never going back to flat myself

and member Brian/IMM has made some lifters to adress some of the opil problems with high lifts,stronger lifter bodys,oiling to the rollers..ect

lots of home work to do yet for a BB