Ret to Tirz

Hi all! I’m trying to get off reta since I have a surgery next month.
Rrta worked great for me and been taking it for 3 months. I lost about 20lbs.
I’m planning to start pinning again a week after my surgery. Do you think I should stick to reta or get on tirz instead?
I just don’t like the skin sensitivity that reta gives 😭
Thanks!!