Regarding the smoking issue: meat only really takes on smoke in the first hour or 2 on the smoker. Just put in enough chips to keep the smoke going for an hour or 2 and you'll be good. I have an UDS smoker with a charcoal basket that will run 15-18 hrs depending on how much stuff I'm smoking in it. I light it top-down method starting on 1 side. That is the only place I mix wood chunks into the charcoal because by the time the fire gets to the other side and/or the bottom the meat isn't taking on anymore smoke, it's just being deposited on the outside of the meat (leaving a thick, nasty, bitter layer).
You'll get the hang of it, smoking meats/foods is an art form and takes a little practice. I made a few "bitter" meals in the beginning too...
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I prefer baby backs. More meat per rib.
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Spares are pretty widely known as having a LOT more meat per bone than baby-backs. The only time baby backs have more meat is if a large slab of the back-loin was intentionally left on the ribs to make them more meaty, and in that case, why not just smoke a back-loin if you want to eat smoked back-loin?
I will tell you that I used to LOVE baby backs as well because I "perceived" by the looks of the rack of ribs in the butcher's cooler that the baby-back had to have more meat. But one time he was running a special on spare-ribs so I tried them; LOTS more meat on spare-ribs. Not to mention, spare ribs are significantly cheaper as well. My buddy just bought some at a local joint 2 days ago and said they are running $1.29/lb for regular spares.
IMHO, I don't waste my time trimming spares to make St Louis style ribs either. You paid for that meat, why trim it off? Smoke it and eat it; yes, there is a bit of fat and cartilage to pick through but there is still good meat in there. Of course, if you can get them already trimmed to St Louis style for the same, or very slightly higher price (few cents more/lb) then I would go that route.