Well, Andy, just to fuel the fire a bit <g>, the charcoal grill will get hotter than most gas grills. It seems as though you should then get more fat drippings and fat smoke. Also, the higher heat makes it easier to get a good sear.
"To be broke is not a disgrace, it is only a catastrophe." -- Nero Wolfe/Rex Stout
charcoal here. 1) with a kettle grill one can save much charcoal and reuse if the cooking time is short. 2) one is supposed to preheat a gas grill, and leave it on a bit to burn clean. So neither is really better than the other as far as fuel efficient or cost.
I believe that charcoal gives better taste and overall results.