A black exterior finish offers several advantages over other pots. First it is easier to clean, as your cookware is used some staining from soot is inevitable. The black outside finish helps hide this accumulation over time. Second a black exterior absorbs more heat, boosting cooking times. Because the finish is coated or sprayed on, continued abuse in the field can scratch the finish.
Some pots can serve double duty as a baking oven.
A tight fitting lid and non-stick finish is a must when considering pots to serve this kind of double duty. Finish Non-stick coatings are finding their way into camping cookware. Allowing for easy cleanup and aiding in the making of perfect pancakes, a non-stick finish on the inside is very desirable when out in the field. Make sure there are no disclaimers on the cookware about using metal utensils while cooking that will scratch the surface. The latest generation of materials is tough as nails and can take some scraping in the field.