I too have been on a several-year quest for the Perfect Stove System. I think I'm getting close with the novel Caldera versions that the TD skunkworks is producing nowadays. (Kudos to Rand and his team for responding so effectively to our critiques of the original Caldera, especially regarding packed volume.) I just got a Ti Sidewinder for Christmas fitted for the short/wide 0.9L Evernew pot, and I have my suspicions that this may be The One. As-is it has one failing that keeps it from being quite Perfect, but I'm working on it, see:
If I can pull that off I think that the 0.9L Evernew will be clearly superior to the 0.6L version in that it allows a larger pot for possibly less packed volume and only trivially more weight. (Because the 0.6L will never fit the stove inside the pot alongside the Sidewinder, and thus the stove will have to be packed separately in the Tupperware container provided.) EDIT-- I've been told that this is incorrect, and that a trimmed 12-10 will indeed fit inside a 0.6L Evernew pot.
Of course, as has been mentioned one's cooking system is a particularly personal choice- kind of like footgear. One person's Perfect is another's Detestable Failure. Here are my thoughts:
1. Why alcohol? Well, honestly, mostly because alcohol stoves are fun to putter with. But I do believe those arguments and analyses that contend that alcohol is lighter than canister stoves for shorter hikes in the 1-week or so range. I'm also getting into Simplicity nowadays, and it doesn't get much simpler than a puddle of burning liquid fuel. Liquid fuel that is easily acquired almost anywhere in the world, mind you, and can be packed in a repurposed soda bottle. (Clearly, though, not a great option for extreme cold-weather camping. Especially if you have to melt snow for water. I acknowledge this.) Why not Esbit? Well, I admit that I have an irrational dislike of Esbit. I can't really explain it- I just do. But, hell, the Calderas all come with an Esbit stove, too.
2. Why Caldera? Yes, a simple cat-food stove is essentially free, and folded aluminum foil works great as a a windscreen. And this option is indeed very Simple. Granted. But it also tips easily. And I was sold by the multi-fuel properties of the Ti cones, particularly woodburning, but as mentioned Esbit is an option too. Also, the cones do seem to benefit from some small increase in efficiency compared to most other systems. I'm sure that more efficient custom systems are out there, but this would require quite a bit of experimentation and fiddling on my part to put one together and I'd rather just hike. The big downside to Caldera USED to be that the cones wouldn't store inside their pots and thus needed to be packed in a separate plastic tube that consumed more pack space, but this is no longer the case with some newer pot/cone combinations.
3. Why 0.9L Evernew? This seems like the right size for my solo camping style, and in a pinch can still cook for two. (Other than dayhikes with my family I can't remember the last time I hiked in a group larger than two.) My style involves a freezer-bag main meal plus some tea or other hot drink, so 0.9L covers it nicely. The short/fat 0.9L is also, well, fat, as opposed to a tall and skinny mug-style pot which suffers in efficiency. 0.6L seems just a hair too small for me, though I know that some on this forum make do with much less. An 0.75L short/fat Evernew might be the sweet spot for a solo hiker like me who is willing to lose the easy ability to cook for two, but is unavailable.
Disclaimer- I haven't actually USED this system yet- I just got it a few days ago. But I've used the Tri-Ti version for the MLD and Vargo mugs for quite a while and it was Almost Perfect. This formed my opinion about what might be Actually Perfect for me, and hence to the 0.9L Evernew Ti Sidewinder.