re: Gas or Charcoal

If you aren't willing to at least get a medium sized grill for the charcoal, pass on it.

In my experience, using the smalls may not have enough fuel to maintain a high enough temperature to cook the food well.

One time on a small grill I had leg quarters on the grill for an hour and a half, and the chicken never got to its recommended temperature before the fire was dying down....which leaves you kinda SOL. You have to be very careful with the small grills that you don't overload the grate with food, which can happen fairly easily.

Grilling with charcoal imparts a definitively better taste, at the cost of loss of easy control. You will need to note where the fire is the hottest, and possibly rotate food constantly as the situation requires.

Gas grilling sacrifices that complexity of taste to make it idiot proof.

To me, there is no hard pros/cons. It depends on how you use it.

If you want to grill in a holiday esque setting where you park next to the grill with a beer for a few hours, charcoal.

If you want a grill to cook a quick off-the-cuff weekday meal, gas.