Gas and charcoal are both my favorite but for different purposes. Depending on what is being grilled, I think a good gas grill is better for most people's needs most of the time. There is little flavor advantage to charcoal because it doesn't impart any flavor of its own; it's just carbon. (Wood fired cooking is a different story, of course.) The main advantage it has is being able to reach higher temperatures while emitting much less water (which is a byproduct of the combustion that occurs in a gas grill). This hotter, dryer heat can deliver a better high-intensity sear on foods than (most) gas grills can. And with a better sear comes better flavor. This flavor doesn't come from charcoal per se; it comes from the the high amounts of radiant heat. A suitably hot infrared element can deliver almost identical results.
Of course, high intensity heat isn't the way that you want to cook all or even most foods. For moderate heat grilling -- which is most of what you want to do with a grill -- gas works just as well as charcoal without the setup and cleaning hassles. And if you're cooking for a crowd, the convenience of a larger propane grill can't be denied. So for me, it's charcoal for searing (and yakitori) and gas for everything else. And for flavor, top marks go to wood coals (or a mix of wood and charcoal).
Of course, high intensity heat isn't the way that you want to cook all or even most foods. For moderate heat grilling -- which is most of what you want to do with a grill -- gas works just as well as charcoal without the setup and cleaning hassles. And if you're cooking for a crowd, the convenience of a larger propane grill can't be denied. So for me, it's charcoal for searing (and yakitori) and gas for everything else. And for flavor, top marks go to wood coals (or a mix of wood and charcoal).
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