In reply to ClimberEd:
For quick eating of water, if you are using the stove outdoors, you really need a windshield. I discovered this the hard way once in the Cairngorms. We had a very fast and powerful gas burner but now windshield, and our pals had a very slow meths-fuelled Trangia. They finished their third course before we had finished our first.
So, unless you are cooking in a place with no wind (ie inside a tent or a bothy), then go for a stove with a windshield.
Also, unless you are cooking on a smooth and level surface, get a stove that is really stable. Stoves with burners separate from the gas canister are inherently more stable than stoves mounted on top of the canister. And even if you are cooking inside a bothy on a table, it is still nice to have a stove that is hard to knock over. You can get fitments to put on the bottom of a gas canister to make it more stable, but they are still less stable than the separate canister set up due to a far higher centre of gravity.
Finally, if you are cooking in cold weather (near or below freezing) then the gas sometimes liquefies and you get very low power. Having a canister on a hose means you can swirl the gas canister round to give a bit of a power boost, or even dip the canister in some warm water to keep the gas flowing.
I like my Trangia with gas adaptor. It is not much heavier than some specifically ultra-light systems when you take into account an external windshield and stabilisers, but is very sturdy and easy to set up. When you are cold and tired and a bit shaky from sugar debt, simple is good.