From everything I have read and heard from people on this site, the folks at Scottsdale Bariatric are not steering you wrong.  At that weight with that much to lose your odds of being succesful are MUCH greater with a bypass.  That is just based on the numbers.  I was originally exploring both surgeries and they would have let me go with either but ultimately I decided the bypass was better for me.  First of all, I wanted the malabsorptive components of the bypass to help me with the initial weight loss.  Secondly, the thought of the fills and unfills to hit the band "sweet spot" really seemed like more of a burden than I wanted to deal with.  Also, the thought of a foreign object in my body creeped me out a bit as did the needle stick for the fills.
    My weight issues were really derived from a lack of self-control as well, I just liked food and wanted to eat lots of the yummy goodness.  My bypass has given me back control of my life.  I wasn't really hungry for the first 6 months or so, just ate at my prescribed meal times to get in my nutrition.  Now at a year and half out, I eat like a normal small person which was all I wanted out of this surgery. 

   As mentioned by somebody else, you're gonna have the extra skin no matter which surgery you choose, I think the only reason it might be seen as "worse" with the bypass is you lose weight faster so it will be noticeable faster.  I think in the end a couple years out from goal weight, there isn't more or less skin depending on your surgery type.  If you're gonna have it, you're gonna have it and there is nothing to be done about it except wait and see.

   Good luck in your journey.  The doctors at SBC are amazing and I would trust them but ultimately it is your decision.

Rebecca