We ended up with one rooster in our batch of five chicks, and he was such a darling we fell in love with him and tried to keep him...until this spring when the neighbors complained. We had no choice because roosters are illegal where we live. We did find a good home for him, fortunately.
But there seemed to be something so right about seeing a rooster with his hens. He was the leader of the flock and it made it very easy to move the flock where I wanted them to go. I herded the rooster, and the hens followed. It was interesting to watch the social interactions among the flock. When hens squabbled, the rooster would restore order. He helped stop bullying behavior by the top hen to the lower ranking hens. He kept a watchful eye out for predators. He would find tasty things to eat in the yard and call his hens over to let them eat what he had found. He had a colorful personality and was the center of attention for his hens and for us, too. We miss him greatly!
If we could, we would have a rooster with our flock. It's just the natural order of things. And as Patandchickens said, we really couldn't tell any difference in the fertilized eggs.