I use both! Haven't formally changed my name, so legally I'm still Ms Maiden-name, but my husband's name is easier to spell (i.e. I don't have to spell it at all!), so I'll often use it for other things, even though I don't have any legal documents in that name (think supermarket shopping deliveries, etc).
I always wanted to keep my maiden name for work anyway and it was too complicated to try and get the bank to recognise two different names, so I haven't bothered.
My husband didn't like it to begin with, but I pointed out that he doesn't wear a wedding ring, so I told him I'd change my name if he wore a ring, so we agreed to be happy with each other's choices!
The person that seems most offended by my choice is my own mother, who I still share a name with!
We don't have any kids and aren't planning to, so it doesn't make any difference to us really. It doesn't make us any less married that we don't share a surname.
Ultimately, OP, you can choose whatever name you want, whether it's one that's been given to you at birth, one you take at marriage, or one that you choose at any other point in your life (like Phoebe in Friends, or should I say Princess Consuela Banana Hammock?!).
If anyone is telling you anything different (at least in the UK), they're talking bollocks.