I dry rub ribs. No marinade. Smoker set for 170-190 with hickory chips. Ribs go on maintaining that temp. I use wood chips for 3-4 hours. Wrap ribs in foil at 4 hours. Total smoke time at that temp is 9 hours. Then I baste them in KC Masterpiece Original BBQ sauce. I have actually tried different sauces including homemade and the KC works for me the best.
Anything under 250F is still 'smoking' range, but plan on less time. This last batch probably averaged 210-220 and after 7 hours, it was perfect.
^All of that is for 'fall of the bone' ribs. Not 'pull off the bone.'