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About 3 to 4 to 1 bb's to spares (just because I have more of them. gotta buy 3 racks at a time at Costco). I do spares St Louis style/cut. About every 6 weeks, I'll throw on some beef ribs.
I'm w/ Mike for the same reasons except that BBs are usually $3.99 around here, we see spares for about $1.29 on sale fairly often. And I really don't know why anyone would cut the best part of the rib off (the brisket) and call them St Louis style.
Around here, we call a good spare a "steak on a stick".