I know you asked about neutering - but both my girls were spayed at 6 months. This was before I had done any of my own reading about it, nowadays I wouldn't do it that young.
If I had a male I'd keep him intact as long as possible. If that ended up being his whole life, great. Would depend on circumstances though, for example I wouldn't want to own an intact male and intact female, that's a little more trouble than I want to manage.
Most issues that come up though I think are more attributed to training, and not just the dog being intact--so neutering wouldn't be my first option if my dog were having behavior problems.