I have an
18" Weber smoker, and a 22" Weber charcoal grill. The smokers work best in the 230-275° range, and seem to 'want' to stay in that low & slow barbecue range. The grills are happier at about 350 with the indirect method, and much hotter by the direct method. I suppose I could roast a turkey in in the grill, but a 19 lb bird might not fit, and I would have to keep adding charcoal to roast for 3 hours. The smoker can hold a lot more fuel, enough for 6 to 8 hours at lower temperatures.
I'm used to smoking pork or brisket in the low & slow temperature range, but this recipe specifically calls for hotter temps for turkey. I've found brined turkeys produce a flood of liquid as you roast them, so maybe they won't dry out with the higher temps.