Have an elder DS, and also toddler boy/girl twins.
Older DS is loud, dramatic, hates football, big into science and computers. We are currently about as close as you can be with a teenager, who I generally annoy just by existing or having the audacity to ask him if he wants a fry up.
Was pleased to hear DTwins included a girl. She is no different to her brothers whatsoever. I mean, I can stick her in a dress, and buy twee stuff for her hair, but she's forever bringing bugs into the house, yells at the aeroplanes from the nearby airfield, and is mainly covered in mud, just like the others.
I have to say, affection wise, loving wise, hands down is boy twin. He adores his mummy. He's the one who will sit and watch a film cuddled up with me. He'll have ten seats to choose from but will always try to sit on my lap. He's the one who rushes to me with his little face lit up in the mornings, and is my little shadow. Elder DS was quite like this. DD is not in the slightest.
I think if I didn't have DD I'd be always wondering about the mother/daughter thing that I never had. Now I have it, it's really nothing like society hypes it up to be. Knowing what I know now, it's not about boys or girls and I would have missed nothing by only having three boys, or indeed three girls.