I think that you should choose the name you like best and the one which goes best with the first names you choose for your DC.
If you are not married when you have your DC, then the choice is entirely yours, from a legal pov.
I hate the assumption that men get to give DC their last name. It's almost as if the woman had nothing to do with it. His name is not more important than yours.
when I had my DS1, I was not married to his dad, so gave my son my name. If we had not married and stayed together, I didn't want to have a different name to my child. When we did marry, I only changed my name (and our sons) because I liked his name better (shallow emoticon
). If I hadn't, then I would have kept mine and given it to our DCs.
My (now) DH put no pressure on me to give my DC his name, because he recognised that my rights to name our child were at least equal to his. I had pressure from my ILs, which I duly ignored.
Ask him if he would like to change his name to yours? You can tell a lot about true attitudes regarding equality from the reply.
In Denmark (where my DH was born) it is common for siblings to have different last names (some mums, some dads) and for women to keep their own names.
Another alternative is to choose a completely new last name for all of you.