Such a personal decision
I will say that my surgeon recommended lumpectomy, and I went with her recommendation. I ended up with a re-excision as margins weren't clear even after chemo. 5 years down the track, some additional breast shrinkage post radiation and my treated breast is at least 30% smaller than the other. Significant enough that I wear a partial breast form. I'm waiting for some revision surgery that's been delayed by Covid, then other health reasons.
If I'd known all that then, I probably would have pushed harder for a mastectomy. I didn't have to think about it so I still don't know what I'd do about reconstruction