I've always found the lighter the smoke the better the taste. I'm trying to eat food not take pics. The coffee can method just slows down the rate the fuel burns giving a longer burn. Be warned though that can give you hot spots on certain parts of your grill as the coals burn since it's not uniform across the grate.
~Jimmy~ 18.5 redhead, UDS, Smokey Joe, Smokey Joe Smoker