I'm assuming backpacking stove. For tent camping, a large Coleman type run either by propane or for us old-school types, white gas.
If you backpack in the winter and need to melt snow for water, you need a white gas stove. MSR makes the best ones, hands down.
Finally, for a true survival situation where fuel may not be around to buy, it's hard to beat a ZZstove, sometimes called a Sierra Stove. basically a fan run by a battery (pack a few spares) under a small bowl that you can fill with twigs, charcoal, I am told some prefer well dried elk dung, basically anything that will burn.
Great little stove, just illegal in a lot of wilderness areas these days due to bans on burning wood.