I think it is very hard to give any definitive answers.. you really Need to understand yourself and why you need surgery.. I was a fat toddler, fatter kid, obese teen.. reaching 310+ at my highest.. I dieted all the time, losing 30-60+ at a time, only to regain. Finally got out of a bad relationship at 21-22, and lost from 310+ to 155 in about 1.5yrs or a bit less on my own VLC diet (800 cal).. You would think my metabolism was busted, but frankly it never was.
My first diet was 7-8 years old, and I went through every you can name over a couple decades, from Optifast, Nutrisystem, to WW.. I lost like gangbusters but never maintained, until the VSG. Despite adding about 15lbs a year for the past two.. these last two have been the most trying my my LIFE, and in other times, the weight would have piled back on.. the VSG gives me a pause.. just a bit more time to reign things in.. which is what I needed. I got a good surgery, and a well made sleeve- I have read of others not so lucky in that regard.. so a good part of it does fall on the surgery too. Thing is I Knew What To Do, the VSG just gave me a helping hand to do it better than I could without it..
My gain was solely from poor choices and mostly from self-medicating bad life situations with liquid cals (huge work stress, now gone, and my parents fading health- my father has since passed, and mom has been medicalized for her dementia.) So, stress is lifting, balance is coming back, and as follows- my weight is slowly trending down without my worrying too much about it.. No, I cannot drink like a fish, nor does that make me feel good anyway nor can I nibble non-stop on carby crap all day and expect to be healthy, but frankly, no one can, regardless of surgery type.
Know thyself. If you are broken, and truly need the big-guns, with all the added responsibility that entails, and you are willing to still avoid the carby crap or liquid cals that can sink even the DS, then by all means- the DS is a great surgery when it's needed. For me, I have been acting a frank careless hedonist for nearly 2 years, and I'm at this moment, 176lbs, when my "normal" BMI is 157ish, and my comfy weight is about 10lbs down from there.. not too shabby for a restrictive only surgery.. I knew for me, I didn't want to medicalize myself to the degree the DS would have required, but that is ME. Things can change. I was self-pay, and if I need in the future to revisit something, I'm all for it- but so far, it's been working.. though I've been mucking things up.
edited to add: Dr. Aceves used a 36f on me from what I recall, but that is just a guide not an overall specific measurement of capacity.. so one can't say that you will have uber-tight restriction vs more relaxed.. and frankly, while I can only fit in a few oz of meat and veggies at a time, I could go back in a couple hours and have more, and over and over.. so it really comes down to behaviors and habits. Do I actually physically feel hungry- no, not usually.. unless I haven't eaten in 6++ hours.The restriction is a great reset button, where you go from there..