Back in the day my pick would have been an MSR Whisperlight. Ya can't beat white gas for bang for the buck or the ounce, and wasn't much else available.
I used to do rugged five day loop trips with my wife, and cooked three big hot meals a day plus several additional pots of coffee or tea with one 20 ounce MSR bottle, and always had enough fuel left over for an extra day. I figured that stove was pretty durn slick.
These days I use a Trangia 25-3, and love it. At 32 ounces it's about the same as the MRS Whisperlight and pot set I carried fer twenty years running and I don't notice any difference in fuel weight. I'd probably carry 16 ounces for five days.
Cooking with alcohol sure is different than cooking with white gas, but in my experience either works just fine once you get the hang of the ins and out of a particular method.
Cooking for lots of people in nasty conditions with alcohol is a snap - If you got the right outfit -
This is me on a recent very stormy morning cooking for five hungry hikers at 6,000 ft. above the tree line, high winds, rain, no problem with a Trangia.
On the other hand, if I had taken one of my soda can stoves with a foil wind screen and a walmart grease pot, we'd not have had a hot breakfast that morning.
So among alcohol stoves in particular, the individual setup makes a heck of a difference.
None of this is probably of any help to you, because I know how I like to cook, the size pots I like to use and so forth, and this may or may not have anything to do with the way you like to do things.
You'll likely get folks sayin' that they love canister stoves, some that like alcohol and some that like white gas, some like mini wood stoves or even Esbit tabs.
- shrug - It's all good!
Yer not gonna find a definitive right or wrong answer to this question, just lots and lots of different opinions.
How do you cook now fer shorter trips? Why not just do the same thing only bring a little extra fuel?
If this is yer first time cooking for two you'll certainly need a bigger pot. I don't like anything below 1-1/2 quarts, and the bigger the better, and I like a stiff wire bail on the pot so I can hang it over a tiny cook fire if I need or want to.