First, I'm going to answer YOUR questions:
YES, getting the DS will help you lose and keep off the additional weight you want to lose. YES, there is a difference in recovery for the two procedures. In my experience, the DS was much more difficult to recover from. You will likely be fatigued for at least a month afterward and you will have lots of crazy lab levels. Neither of those things will likely happen with the VSG.
I had a partial re sleeve where the doctor just removed the excess fundus with two staple fires. He believes that a full resleeve is dangerous. BTW, they don't necessarily need to remove the old staples. If there is enough tissue, they can just put a new staple line INSIDE the old one and remove the excess portion along with the old staple line. That's what was done with me. There are two points, of course, where they will have to overlap the old with new staple lines, but that doesn't seem to be an issue.
Now that I've answered your questions, I'd like to share my experience/opinion. I am also a lightweight -- 100 pounds over (pre-surgery) but I am male and 6'3." Few people would have ever described me as obese, rather I a "big guy." Before I had my current GF I didn't have much trouble getting dates (but, then again, I have lovely blue eyes and am very charming).
If I had been 400 pound plus, the DS would have been a no brainer. But it's all about cost/benefit analyses. Obviously at 400 the risks of staying there are likely greater than the risks of getting the DS. But, at my weight, it was not such an easy calculation. I've read every study I could find and still am not fully convinced that the DS is not going to cause trouble later in life. There are no studies done on people that have had the DS 20+ years. There is one study that took place over 20 years but no studies on groups that have had it for over 20 years. There also may be micro nutrients we don't even know about that we're not absorbing and that may haunt us later in life. Some vitamins were only identified and synthesized last century. When you get the DS you are absolutely playing with nature's evolutionary design in favor of a rarely performed surgery that has some good data, but a lot of unknowns. Most of the data, BTW, is put out by DS doctors. It is not in their interest to put out the scary stuff. Not saying they're lying, but if we're going to question the data of a VSG or RNY doctor, why shouldn't we do the same for DS doctors? You are submitting to being deliberately malnourished and trying to make up the difference through supplements. Aside from surgical complications, if you read this board you'll find many people struggling with anemia, osteoporosis, etc.
But MOST people seem to be doing fairly well, but there is that reality.
I made the decision because I was more interested in the quality of my remaining years (I'm 52). I wasn't 100% comfortable for the reasons I described, but I was comfortable enough. I'm still searching the web trying to put my mind at ease.
But, at your weight, I just can't see how the cost/benefit analyses tilts in your favor. It's too draconian a surgery for such a small benefit with too many unknowns. Frankly, it sounds like some self-acceptance work (easier said that done, I know) might be useful. I don't know you so forgive the presumptuousness, but when you post publicly you get public opinions.
Good luck. You, of course, will eventually do what you have to do, but I would definitely say that some LONG, careful thought is in order.
Best, Mark