This is minor, but one thing I like about Charcoal besides the flavor is always knowing where I stand on fuel. It seemed like the fuel gauges on the propane grills were never right. And it was ALWAYS when I was grilling for a crowd that I would run out of Propane.
With charcoal, I like being able to look in the bag(s) and know that I do or do not have enough for the next meal I am buying groceries for.
I use a Charcoal Chimney, so I don't mess around with Lighter Fluid or anything like that.. All in all, I looked at the fact that I had purchased 3 middle of the line Gas Grills for a 6 year period. I kept them covered out doors, and no matter how well it was taken care of, the burners would stop working, or there would be some physical problem causing the thing to just not work right. After the third gas grill started shooting flames out the bottom towards the tank, I decided to heck with it.. I bought a Charcoal Grill and love it for all the right reasons.
It's got the Offset Smoker box, twice the cooking space, and very few parts that will ever go "bad" or cause the grill to stop working..
All in all, for me.. It was about taste, then smoking (had a propane smoker too), then economics..
Hope this helps a little bit. I'm no pro, but I am extremely happy with what I have now..
-Brad