Winter & mountain can make a difference. Alcohol stoves generally rely on the heat from burning to feed back into the body of the stove to increase the vapourization of the alcohol, making the jets "bloom". Icy temperatures typical of winter mountains make this difficult. The stove needs to be insulated from the cold ground. Stands like the Trangia kits (and the Clas Ohlson) do this, but at the cost of some bulk and weight (over a pound). Butane canister stoves don't work too well unless you keep the canister in a warm place (pocket, sleeping bag) or they have a v. large proportion of propane in the mixture. I seriously doubt you will find anything better than you SVEA 123 which is a legend in mountaineering circles. Lighter and less bulky maybe, but not better.