I, like Ron, cook with wood, charcoal, and pellets. If I want to have my food have the smokiest flavor, I cook with charcoal and wood chunks because they are efficient cookers that require very little airflow and the smoke stands around a little longer but never stale or bitter. Cooking for the first 6 hours or so of my cook at 180* on my pellet grill, then kicking up the temp to 225*-250* to finish the cook, I get a smoke flavor very similar to my stickburner burning only wood, mild and very good.
IF you use sub-par brand pellets and cook hotter, you won't get much smoke flavor, but if you use a good brand of pellets like Lumberjack (my fav), BBQr's Delight or Cookinpellets, you will get a good smoke flavor, but never strong or bitter. There are also some solutions for supplement smoke if you really feel the need, I never have.
The best part about pellet cookers is you can sleep, run errands, play with the kids, etc. and not have to worry about stoking the fire. Just make sure the pellet hopper has pellets in it.