I would choose the RAI. An out of whack thyroid really messes everything up. I had RAI over 5 years ago for Grave's disease. I would choose it again. My MG didn't start until three years ago and they kept trying to blame it on my thyroid. With the thyroid irradiated,you only have to worry about minor adjustments for your thyroid meds. The antithyroid meds started to destroy my liver so I had no choice but do RAI.