The rule of thumb seems to be that for trips of a week or so, a well managed cartridge stove is as light as any alcohol rig.
Ha! I should have read your post before I responded to Am_Fear_Liath_Mor. Yes, that's my understanding too. About a week is the dividing line.
What seems to be the verdict for when it would be optimum to choose white gas/kerosene stove system? Then it's not only the weight that counts, but also the bulk of all those canisters.
For me, it is merely intellectual curiosity - I choose stove system based on the performance I want. I hardly use alcohol for anything else than priming, but it is my canister system that sees the most use.