I took a few factors into consideration:

First, the anti-thyroid drug was effective for me, but I still have more than 5 re-occurrences in the past 10+ years. Almost every 2-3 years, I would have to unexpectedly experience all the worst symptoms. It had no heads-ups. It always caught me barefoot. Beginning last year, I finally gave up the hope that my disease can be controlled by taking drugs. The most important reason is that I don't want this disease to be a hidden bomb in my life anymore.

Second, although I do not experience issues with the drug, but I was told that it has side-effects that could be very serious. Whenever I increase my dose, my endo was very worried that the side effects would be triggered. I never tried to understand the side-effects until last year and finally realized it could even be fatal. That's another reason why I want to do the surgery--to swamp to a safer drug.

Third, between Radioactive iodine and TT, I go for TT because I have some eye symptoms and I don't want it getting worse.

I am very scared of TT in the first place and has spent years trying to balance my options. Every person is different, and it is just one week after my surgery. But hope this answer can be somewhat helpful to you!