Hello dear, thanks for your post! I think that this is something that you need to discuss with yourself and think about which part of your body is giving you more discomfort. I recommend to take your time thinking about what you really want and then go to a Board certified plastic surgeon and talk about your concerns and also about your goals. Good luck and best wishes :)
Choosing which operation you want really is a personal choice. Going with the tummy tuck or breasts is up to you.