A dissenting vote for gas cannisters. However,you need to know the tricks for it to be effective. Cannister has to be kept warm-tucked into your jacket before you need it,or toss it in a sleeping bag at night. An insulator pad under the cannister,and a heat disperser plate on the stove make s all the difference too.
In extreme cold(-10 and lower) it can become a problem using the cannisters
Lower than -20,I'll be sitting in the kitchen having coffee with afka-bob!