In the ultra light, ultra tough category, the snowpeak gigapower is hard to beat with a titanium cup and spork. The whole kit weights almost nothing. Down side is, it's not ideal for long trips.
Jet boils are great, but are terrible in cold weather
If you hunt with 2-3 guys the MSR Reactor is a sweet set up and will boil water quicker than any stove and is good for extended backcountry excursions.