I usually go with a variation of the the 3-2-1 method, depends on the rack. As for seasoning i usually use Meatheads Memphis Dust recipe and for sauce i usually use Sweet Baby Rays. Lately i have been trying different sauces to change things up. Normally i use a mix of apple and hickory chunks, but lately i started using pecan and i really like it.
Second that on the memphis dust. I made a few changes according to my tastes, but it's the base of my rib rub. (I add cumin, use turbinado sugar instead of brown, a bit of extra spice, but generally the same ingredients as the memphis dust)
Some things that help for my ribs:
1. trim the ribs well. it makes a world of difference.
2. dry brine the night before, rub and wrap in plastic for a few hours before going on cooker
3. wood types are flexible, but I'm partial to fruit woods for pork (cherry or apple)
4. 3-2-1 at 225 ends up making the ribs too soft for my taste. At 225, I'll run 2.5 nekkid - 1 hr in the crutch - rest of the way in the smoke. (about 1 - 1.5 hrs is a good baseline)
5. glaze with sauce during last 30 min to get a nice coat. not a fan of carmelizing over direct heat. too burnt for my taste.
cook times will depend a lot on your cooker and how much you open it up to admire your handiwork.
My wrap usually involves brown sugar base + apple juice + a pat of unsalted butter. I use a tight double foil wrap.
For sauce I'll do one of two things:
1. The wrap juices - I'll take those out and boil them down until thick. After it boils down, add a dash of sriracha and a good spoon of honey or maple syrup. Use this to glaze the ribs for about 30-40 min. and sprinkle just a little rub over them after they come off the cooker for a sweet/heat rib.
2. Bourbon sauce short cut - take a commercial sauce (sweet baby rays works well). Mix in some white wine vinegar, Worcestershire sauce, chipotle pepper, black pepper, and a healthy splash of bourbon. Glaze with this for a tangier rib.
Not to forget the obvious: Buy good meat. Costco ribs are solid. Walmart's spares are thin and leave much to be desired, so you really have to look for a good cut. If you have a good butcher or you are up for ordering it, Kurobota Pork is something really special.