I have both, an 18 (well 2 of those) and a 22, I don't consider the 22 a "charcoal hog." Will it use more charcoal, YES, it's bigger. Does it use an inordinate amount of charcoal, NO. I did 4 butts on my 22 last week, with a full charcoal chamber and the Minion method, I got a 15 1/2 hour burn (the butts were done in 12, it went 15 1/2 hours until I would say the fire was done. The biggest issue between the two, IMHO, is capacity. How many people is your friend cooking for? Does he anticipate needing more cooking capacity? Would he like to be able to lay 3 racks of ribs down on the grate at the same time? Budget...can he afford a 22" WSM? The cost of charcoal is so not an issue, there are so many sales on charcoal throughout the year, he could stock up at one of them and have enough for a whole season. I was always taught, you find the cooker you think is right for your situation and then, buy the next bigger size. I have NEVER been disappointed with my 22" purchase.