I've done both and to be honest, I didn't feel right about shooting mom.
One time I had one of the fawns stand there and stare at me as I was getting ready to gut the doe. I felt terrible and that memory still haunts me.
To this day, I prefer to fill antlerless tags with a fawn if given a choice.
Much better eating although less meat. That's alright too if you and your family have multiple tags.
I ain't ashamed to post a pic either.
Here is where one of last year's antlerless tags went.