To be honest, as much of a pain it was to have two siblings when I was a child occasionally, overally it was pretty excellent. I think that I learned a lot and benefited quite a bit by not being an only child. As for really answering this question, I think that life would have been far different if I had had a sister, but I have no idea if I would have preferred it or not. Having brothers was good for many reasons: though we didn't always get along (far from it) we've become far greater friends since growing up, and I really truly appreciate having them as siblings. In short, I guess I don't know it any other way and as such wouldn't change it even if I had had the choice.