Do I choose surgery or chemo first?

I am having chemo first and was trying to work out the treatment order a month ago. With mine it’s too big to take out the tumour, so  I would have had to have a mastectomy straight away. This way they said my tumour could shrink and reduce the surgery extent, plus chemo can kill all those stragglers..... I started chemo in December, can’t say I am enjoying it, but it’s just something I have to do. It also gives me time to think about surgery and recon etc, and get more information. I also get this time with both breast intact, even though Cancer is in one of them,