It's worthwhile to also consider getting a sleeve first, and after 12-18 months, think about adding the DS component.
We have several heavier patients on the board that have had fantastic results with just the sleeve. You would still need a few vitamins with the sleeve, but much less.
A big question to ask yourself is whether you think you can stick with a "diet" forever. ALL of these surgeries (including the DS) require mindful eating forever.
I had the opportunity to speak with a 10 year DS veteran, and she lost about 200lbs. She was still 100lbs from goal, but the scale just stopped. She was eating on-plan (meat and veggies), but wasn't counting calories. When she finally started counting, she realized she was eating 2500 calories a day!
She started cutting back to 1500, then 1300. She finally reached goal.
My point is that no matter which procedure you get, you'll still have to pay attention. And if you pay attention, it won't matter much which procedure you get.
@Dashofpixiedust8 might be able to help here.
Don't get me wrong, the DS will be extremely effective for you. But the vitamins are not optional, and if you are concerned about them now, what happens in 2 or 15 years when you get bored of the whole thing?