Going flat after mastectomy: pros and cons from survivors?

Hello, I was diagonised in Feb with Triple positive, Estrogen/Progestogen Positive, HERS2+ breast cancer. I finished my 6th chemo treatment a week ago today, now I’m trying to decide if I want to have a lumpectomy without reconstruction or a double mastectomy without reconstruction. I’ve had implants in the past and had several issues with them so I had them removed a few years ago and don’t want to chance getting them again and having issues. Is there anyone who went flat and is willing to share some pros and cons after living with their decision? If so it will be very much appreciated. My cancer was confirmed in Feb, two days after my 58th birthday and on my 39th wedding anniversary. Wishing all positive thoughts in their journeys! Lisa