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Get ready for a lot of different answers. Different charcoals burn at different temps, some burn longer, some add flavor, others do not. There are too many variables to say one charcoal is the ultimate.
Wicked Good is a very good product that burns very long, doen not add flavor, low ash and is a little bit more difficult to light than others. If you have a local supplier it will run about $20 for a 22# bag. WG should be available from most ACE Hardware stores in the very near future. If it is not stocked just ask someone if they would order it for you.
I would recommend trying a bunch and figure out what you like and go for it. Good luck in you charcoal quest!