The best thing I can say about alcohol stoves is that it will run, at least nominally, on easily available stuff like rubbing alcohol and the alcohol stove is a step up from the Triox and Hexamine solid fuel units which seem entirely suitable for heating up a GI canteen cup of instant coffee. As long as it isn't raining or blowing too hard.
Used an Esbit as my primary stove for a couple of years. If you stack 3 Esbit tabs and have a good windscreen it will boil 2L of water in about 5 min. You'd be surprised how hot those tablets burn. I'd say they're at least equal in temp to 91% alcohol.