You sound much like me. Pre-op, I was ALWAYS hungry---always. I simply NEVER felt full.
I chose the DS for many, many reasons---and one was that it compltely removes from the body the excess stomach tissue, tissue that produces most of the body's 'hunger hormone', ghrelin. Now, I do still get hungry---about 3-4 times a day, like normal folks do. (*grin*) And I'm completely satisfied with the small-to-average portions I can eat.
Another reason I chose the DS was that I LIKE FOOD. I like full-flavor, high-calories foods like well-marbled meats, cheeses, nuts, seafood, rich sauces, gravies, etc. Since the DS targets the absorption of fat---I only absorb 20% of the fat I eat---these sorts of foods are now healthy, nutritionally-dense foods for me. (I have a bacon cheeseburger at least once a week.) At almost six years post-op, I'm maintaining my lowest adult weight EVER, and eating 2500-3000 calories of rich foods every day.
There were a lot of other reasons I chose the DS, too. I knew I'd always need to be able to take NSAIDs. I wanted a fully-functional stomach--- I didn't want dumping syndrome, or any of the other troubles associated with having a stoma.
And I wanted the form of WLS that's been shown to give the very best long-term results, especially for those of us with a starting BMI greater than 50. I knew that I had only one chance to have WLS and I had to get it right the first time.
I strongly encourage you to visit the DS forum here at OH, and www.dsfacts.com . Learn more about this wonderful option---you just might find it's a better choice for you than the RNY.