I have ustable primary hypothyroidism and have been on treatment for 21 years now. Whilst it was not discussed openly by my surgeon as a factor that would influence the surgery decision, i had already taken it into consideration when deciding in advance of my clinic appointments which surgery i would prefer.
Due to the low metabolic rate i have, i figured i needed all the help i could get, so the extra malabsorption with the bypass was always going to be a big help to me. My surgeon agreed that the bypass was the best op for me in relation to my eating habits anyway.
Personally i think that the decision about which op to have will be more dependent on your eating habits and how much you need to lose. Chat to your surgeon about it. I'd be interested to know if it influences the decision. x x