If you do BB ribs your times will be pretty close; however check the chicken for an internal temp of 160 at breast and check the ribs with a toothpick for tenderness. If you do spare ribs, your cook time for them will be closer to 7 hrs and the chicken will have to come off first.
Down here in the Deep South, hickory is the most commercially available wood and I think you'll be alright if you don't use more than 3 chunks. However, if the other mentioned woods are available to you, then you may be better off with them.
Cooking chicken low and slow will not give you crisp skin, but the flavor is great. I discard the skin to avoid the extra fat, which, of course, I immediately make up for with the ribs and an occasional boston butt. /infopop/emoticons/icon_smile.gif
Good luck.
Paul