U only want about 20 to 30 minutes of actual smoke....after that the smoke starts to overpower the meat...subtlety of flavor is what ya want...
I use Mesquite Hardwood Charcoal that I buy in 40 LB bags...When using the Big Greeny all I use is the Mesquite Charcoal...I don't use wood chips or nuthin...and the flavor is sublime.
If you have followed my musing U would know that I have a David Klose BBQ Pit, the Big Greeny and a Weber Kettle...each has its specific use..
When running thw Klose BBQ Pit I like to use Oak or Fruit Wood Logs burned down to just the point where the flames die out and what is left are the glowing coals...it usually provides about 20 to 40 minutes of smoke which is just about right for the smoke flavor..
.