I usually carry 1-2 bics, flint/steel, stormproof matches, and a little firestarter. I've used a variety of the butane lighters and broken every last one of them. Also not terribly functional in cold temps or high altitudes. If it's too windy for the bic, then the flint will light your canister stove nicely.
I like my little fire steel. I never carry a lighter. But I do carry backup matches, and petroleum jelly cotton balls. Use the steel for starting the stove, and if I need a quick fire I usually light the stove to start the fire
Bic failed me in a blizzard with almost zero visibility.....however it was because no matter what I did for a wind break it would only stay lit for a second.....I now carry trioxane so that second will be long enough
2 small bics, fire steel, trioxane, and waterproof matches.
I find it easier to use a match to light a fire in my kifaru stove, so I recently put a small box of kitchen matches in the kit. Also I try to use pine pitch instead of trioxane when I find it. I would like to get to the point where I can reliably start a fire with squaw wood, pine pitch, and a fire steel in any weather.
I use to carry a magnesium fire starter instead of a fire steel, but it was heavy and hard to use.
If I know I'm going to be in snow or really cold conditions, I try to remember to put the bic in my pocket