I prefer spare if I wanna get fancy lol I trim them to St. Louis but I'd rather just cook it all. I don't have a set time the 3-2-1 wasn't consistent enough for me I go 225-250 temp and check them after a hour for color once they get the color I'm looking for I wrap them and go around hour and a half check em to see if there getting where I want. Then depending on how I did in the foil I'll go back on for whatever amount of time I need to get them where I want. People ask me how I smoke em and I can't explain lol it just came from trial and error and what I'm looking for temps and times don't do me any good it's all on the meat and how it's going. I want certain color and not fall off the bone but still tender. I pull membrane , rub, and put on hickory and apple. Foil in honey, brown sugar, put back on smoker and sauce little before I pull em off. I don't spray them ever but that's just my personal approach I know a lot of people do.