Originally posted by a palombo:
I usually use lump charcoal.
Is there any major differences in terms of flavor?
Depends on what brand of lump you're used to using. But in general, YES there's a difference in flavor. Lump (quality lump, that is), is natural wood burned in the absence of oxygen down to a charcoal state. It IS wood. Briquettes (especially Kingsford) contains some wood and quite a few fillers. So the flavor can vary.
Another thing that will affect the flavor is the method of starting and timing of usage. In my experience, Kingsford briquettes can burn quite cleanly if you let them completely ash over before use.
If you use lighter fluid to start the briquettes, that could give a different flavor vs using a chimney starter (or starter cubes). Using the minion method for long cooks could make a difference in flavor as unlit Kingsford briquettes do emit a very noticeable odor while they're coming up to temp. Whether or not this makes a difference in the flavor of the final product, and the degree of that difference is debatable.
Do I need to use more smoking wood with the briquettes than I would with lump?
In general I would say YES. But the degree of how much more wood depends, again, on the type of lump you're using. Some lumps - especially those of a mesquite origin - empart a stronger wood flavor than others. In those cases, more smoke wood would be needed than if you're used to a milder lump.
When in doubt, I say go light, and you won't be disappointed. Hope this helps.