The charcoal will affect your quality, temp control, and how your food tastes.
If you’re looking to get the best bang for your buck, lump charcoal is the best since it is easy to light, re-use, and actually can maintain that state of burning for a much longer time than other types of charcoal. It is also the most natural kind of charcoal, with no chemical additives. It can also come in different wood types like oak, apple, and mesquite, as well as others.
When using a kamado grill, it’s also important to note that you shouldn’t be using lighter fluid or other chemicals—especially if your kamado is made out of ceramic.