Smoke ring--Lump charcoal vs Kingsford briquettes?

I have read posts that say lump charcoal is the best way to get a smoke ring and others that say the Kingsford briquettes are the best to use. I was wondering if anybody has used both and knows which produces the best smoke ring? I am hoping the lump charcoal produces the best smoke ring since it doesn't have the fillers that the briquettes have, but maybe it is the fillers that cause the smoke ring? Also, how much charcoal do you add to wood box and if you add charcoal do you need to reduce the amount of wood so that you don't end up with too much smoke? Thanks.