Lumpectomy versus mastectomy

Is it more common to have mastectomy rather than lumpectomy when diagnosed as er-pr-her2neu+? I had lumpectomy, A/C, taxotere and radiation and am wondering if I should have insisted on mastectomy. My surgeon said he did not think that was any better than lumpectomy in the long run. Any thoughts or experiences would be appreciated. Thanks - and hope everyone is able to relax this week-end