Mostly the camp fire. But for that coffee in the AM it needs to be quick! A cheap burner and lil coleman bottle and that has lasted me for years! Not the lil bottle but burner
Use a campfire. If you can cook an egg in a paper bag, why use a stove. Yes, I know that you can't always use a campfire so for that scenario, a soda can stove, trioxane tab and empty tuna can or something along those lines.
I use the camp fire first. then i'll use a soda can stove. I've got an MSR whisperlite. great stove,but I haven't used it in years. I also have a snowpeak giga power stove with a GSI outdoors pot set, think it's the soloist. then there is the ol' esbit.