I have a cider can meths stove. It weighs a whopping 17 grams.
But comparing it to my standard screw on portable gas stove for weight, the gas stove wins in the long run. If i take my gas stove and a full can of gas and the equivalent amount of meths to run the meths stove, the meths alone far outweighs the weight of the gas canister and stove.
It does depend on how much i want to use a stove as to which comes out on top.
For a few cups of tea the meths stove is excellent as i know exactly how much meths to take and can minimise on weight by doing so. With a gas stove i don't know exactly how much fuel i have and also have to carry the heavy canister and stove regardless.
Horses for courses!