It depends on how many people you go with.
Neither are what I would think of as efficient. The best I could manage was about 1/3oz per liter, about average for the SVEA. Both require what I consider a high flame setting or they go out. (They run about 3,000BTU or so, slightly less than 1/4 the full output. The svea runs about 800btu output, slightly more than an alky stove. Max out put is about 5000BTU.) The best I have managed with them is ~1/4oz (.23oz average for 5 runs) per liter. For 2-3 people, it makes a lot of sense to go with WG. But, that said, the pumping mechanisms tend to be a point of failure.
Fuel density of alky and canisters are so close as to call them even after calculating the weight of a plastic bottle and cannister in.
Fuel density for WG (depending on the brand) is around 3/4 more than either using a PET (plastic water bottle) to carry fuel. This assumes you have a self contained WG stove. Neither of the ones you mention, qualify.
Consumption is a BIG BIG variable. Due to the weight of the stoves (empty, the SVEA weighs ~16-17oz...it varies.) For me and being out >5 days for two people, it about breaks even with alky for weight. Canisters go about 6 days, but a lot depends on the type of canister you use. Coleman 8oz weigh close to 16oz for example. MSR 8oz weigh closer to 14oz. Neither of the two you mention will break even till 10-12 days with alky. Melting snow is not really the best use for alky or canisters, but canisters are somewhat better than alky. Usually, you need good output, you don't really care about fuel weights in winter. The Simmerlite really puts out some heat of you have a good wide bottomed pan to use it.
A TALL cone can be used, instead of the pot stand. Just insure you move the pan about 1/2-3/4" above the pot stand if you decide to try this. WELL worth it in IMHO. But, this can be dangerous with canisters, overheating and all that. It works well with a Simmerlite & kin, though. Even the SVEA gets to hot after a liter.