The Coleman Grill Stove is an innovative stove that combines a grill on one half and a single burner on the other. The main question is: do you want so much space dedicated to grilling when you could also just get a griddle accessory and put it on a standard two-burner stove (and have two burners when not grilling). For some people, the built-in grill proves handy. Especially if you want what is one of the most portable grills out there with the option to boil water and cook with a smaller pot. For other people, the answer is to get a standard two-burner stove and then either use a true portable grill like the Weber Smokey Joe (charcoal) or the Weber Q 220 (gas).
For most situations, we prefer the Coleman Triton. We like having two dedicated burners as most of the time we are not grilling. And, often when you are camping there is an outdoor grill set up nearby. Outdoor grills are not very user friendly compared to a gas grill, but they are part of the camping experience (and much better for roasting marshmallows).
For the best two-burner camp stove, check out the Camp Chef Everest or Stansport Outfitters Series. These stoves are about the same cost as the Grill Stove but much better for the cooking you most often do when camping.