I agree with Akrotiri71.
Lumpwood for quick grilling and good quality briquettes for low'n'slow because it's easier to control the temperature. (Not the cheap supermarket briquettes which tend to burn too quickly.)
The porcelain coated (non stick) Weber poultry roaster costs more than a basic frame-holder but the benefits are worth the extra. It also works well for smoked chicken if you have a 22.5" grill.
For more flavour, season the chicken with a paste under the skin or a rub on the outside.