hi penelope pink,
i'm new to the site too - so welcome.
i had the very same dilemma as you and, although i haven't had my operation yet [scheduled for 08th march 2012] i decided on the gastric sleeve option.
the overiding factors being [in my personal opinion based on loadsa research]
a] sleeve op less invasive than bypass
b] possible slower weight loss which hopefully may lead to less 'sagging' of excess skin
c] less chance of 'dumping' occurring
it is a tough decision and, because i have lots of additional health issues i ultimately felt the gastric sleeve op would be safer for me personally and my consultant agreed. he even added that if for whatever reason the sleeve didn't work well for me, he could always do a bypass in the future.
there are loads of very supportive and experienced people on this site and i'm sure you will receive lots of feedback.
good luck to you darlin
loadsa love n' stuff