I have a great respect for any dad that can raise a group of girls.......I vote for boys being easier.....altho I wouldn't trade the experience of raising my daughter for anything.
What I have heard is that girls are easier all the way until puberty. Then the boys are easier.
Certainly comparing my 2 girls with my neighbors two boys (all under 5 years old), I have it easy.
When my oldest hits puberty, I am going to go live in the chicken coop. She is an emotional train wreck NOW, I can only imagine how bad it will be when the hormones kick in.
I don't have kids but I did grow up with 2 bothers and 1 sister and I do have to say that if all girls are the same as I was when I was a kid then I would say boys are easier to raise...no question.