Jetboils were first on the scene but MSR has gone one up with their Windburner, it does not have piezo ignition but is more wind proof and as well as the billy you can get a frypan, and the usual coffee press attatchments etc.
For pure weight the pocket rocket or various copies are the bees knees, but you burn more fuel.
Either system is no good in the high tops though, being gas canisters, for mountain performance you need liquid fuel, not gas.
If I was buying again then I would look at where I was using it, then decide, and it would be either a MSR multifuel or a MSR windburner.
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