I have four children: 8 year old twin girls and two boys who are 10 and 18. Growing up as an only child, my house was nice and quiet and always clean. I always wanted siblings until I got to be a little older, then I appreciated being an only child. It's much easier for parents to provide for one child than it is for more than one.
I am very happy I had my children, but for 8 years until my second son was born, I only had one child and life was -- well, it was much different.
Some people make comments when a couple chooses to only have one child, but I can tell you first hand that being an only child is not a bad thing. I wasn't spoiled or any of the negative things people say about only children. In fact, I don't mind one bit not having siblings.
I don't think either way is better for parents. I think there are pros and cons to both. It is what's best for you as a person, the father, and the financial situation.
I hope that helps. : )