Of the 2 main fuel sources (liquid and canister) there are a bunch of different models of stoves out there, but 2 basic types.
One type is basically a blow torch. The MSR pocket Rocket is one of these. This is the one I use the most. Basically it's good at boiling water for dehydrated meals and tea/coffee. It sucks for simmering or slow cooking something, but will heat up a few cups of water in no time flat. It looks weak, but is surprisingly stable. This is the ultralight option.
The other are more in tuned for cooking. The one I have is the Primus Omni Fuel. I can use both canister and liquid fuels with it and it has a larger flame area so it works better for cooking. The drawback to this type is weight and size. Liquid fuel stoves take a bit of learning on how to prime it in different conditions, but you can run just about any type of gas through them in a pinch. That's where the Omni Fuel kicks butt. If you run out of canisters on a long trek, you'll find some kind of liquid fuel that will work.
A friend of mine has the MSR Wind Pro. It's only canister, but it's pretty compact and does a good job cooking.
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