For me #1 is price. Baby back can be easily double the price of spares. Back back are higher up on the rack and contain a portion of the loin which typically will make them a meatier rib. Which is why most people prefer them. Spares, whether they have been trimmed down to a STL trim, or just the bone removed, or the bone and ribs tips removed is my preference. If I can get 2 racks for the price of 1 back back rack, that's a no brainer to me.
I smoked a rack of STL yesterday for some family. I don't think they knew or gave a damn what cut they were. Only thing left was bones.
edit*
trimmings from spares always get smoked and thrown in beans.
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