The only information I can give is my own. When I had breast cancer at 38, and a doctor who was a friend said “with your genetics, I would get a double mastectomy and pray to be done with it”. I asked my surgeon if we could do this and was told we don’t do that anymore. Being uneducated and trusting my doctor knew best, I agreed to a large lumpectomy that scraped the tumor off of my chest wall.
Fast forward 15 years, geez I wish I had taken the time to research all of that, but hindsight is always 20/20, and I wish I could go back and demand that bi-lateral mastectomy. Now that it has shown up elsewhere, they say a mastectomy won’t stop it. So I still have these scarred and lopsided, painful breasts. I count my daily blessings of being alive, and I don’t dwell on it much. My situation is different from yours, but this is my story, and maybe it helps.
Whatever decision you make, please get fully informed maybe a second or third opinion, read research, whatever will make you feel you can live with your choice. One of the Mayo doctors told us “the only good decision is an informed decision” and I believe it!