For the sake of discussion, one method I would consider perhaps easier than any of the ones you mentioned, because I actually have some personal experience with it, is sparking some tinder fungus (or similar) alight and then using it to develop a coal that, when fanned, could start a flame in a big wad of dry grass. That seems to be less fidgety than the friction methods you mentioned, and it is easy enough to carry around some of the fungus once you locate a chunk. It doesn't take much of it, and it catches a spark pretty easily. Without the fungus, of course, one of the other methods you mentioned could be invaluable. My guess would be, as I alluded to above, that personal experience with a particular method would be of primary consideration. From what I've observed, there is a "trick" to being successful with all these methods.