Many opinions, but proponents of the higher temps also will explain that the faster cook times does not give the meat more time to dry out. The more time something is on heat, the more it drys out.
My personal opinion is that this matters much much more on a lean piece of meat. If I'm cooking turkey, chicken breast, a lean brisket, pork loin, etc I would like to get it done as soon as possible. Obviously, while giving it long enough to pick up some smoke.
If I have a big fatty piece of meat, lower temps will be just fine. Plenty of fat to melt, and keep moist.