I have Hashimotos thyroid, diagnosed in 1998. I was lapbanded back in 2007 and then went to the sleeve in 2014. I don't see any big difference between the two procedures and having a thyroid issue, as long as you take your daily dose of Synthyroid or the generic version Levothyroxine.
One piece of advise,,, stay on top of your TSH levels. I try to keep my TSH number between 1.0 to 2.0. But, everyone is different. A couple years back they came out with new "Normal" levels, that range is .3 to 3.3
I feel my best at 1.0 to1.5