First off it should at least be rated for lowest possible temperature you'll encounter. You may want to even go a little lower just to be on safe side.

Obviously main purpose is to hold your body heat in to insulate you from cooler air. So better insulation holds your body heat in warmer and more comfortable you're going to be.

Insulation

Down-the filamentous and fluffy layer underneath feathers. Positives: All being equal down is warmer, lighter, more comfortable, compresses smaller, and can last a lifetime if cared for properly. Goose down is standard others are compared to. The more it lofts better it insulates. This is known as fill-power, higher number better it retains heat.

Negatives: Down looses most all of it's insulating properties when wet, takes a long time to dry outdoors, is more expensive short-term, and may require professional cleaning.

Synthetic- These are usually hollow plastic threads that serve to trap warm air. Positives: Synthetic sleeping bags retain heat better when wet, costs less short-term when compared to same temperature rating as down, dries quicker than down, and is hypo-allergenic. It's usually well-suited for recreational use, but consider your own individual needs.

Negatives: They're bulkier, heavier, less conforming, and can lose their insulating properties after a few seasons of hard use because of breakdown. More expensive long-term.

Shapes/Styles

Camping cookware, like any camping equipment, should be versatile and tough. A lot of campers have a set of cookware just for camping because they don't want to risk damaging their good kitchen set and/or it's easier to keep all your camping gear organized and ready-to-go in big plastic bin(s). Kitchen cookware usually won't last long in field anyway. Camp cooking outdoors can be a lot more demanding than what most kitchen utensils are made for.

Heavy duty camping cookware is not only a good idea, it's almost a necessity. If you're camp cooking and your only pan cracks or burns through making it unusable, you're either going to have to find a way to use tin foil creatively or eat cold sandwiches rest of your camping trip.

Remember to get camping cookware with tight-fitting lids to help heat food on your camping stove more quickly and to help save fuel, this is especially important to hikers that carry everything. I'd stay away from non-stick coatings as it only takes over-heating them once and surface is junk. Also once surface is scorched chemical make-up is permanently changed and I'm not sure how healthy it would be for you. Non-stick surfaces can also scratch, it's hard enough keeping them in good shape at home let alone camping or hiking.