I groom dogs for a living and I do find intact males are in general harder to work with (especially those itty bitty land piranhas!). With that said, it really depends on the dog's personality and owners situation imo. If your dog is a well behaved, well tempered boy who can be safely kept from breeding (if that isn't an intention) then I see no problem with leaving him intact. There are health pros and cons so it's a very personal choice when it comes to that department.
I personally own an unaltered male bull terrier that is 1yr/3mo old and he's a joy. I wouldn't change him for the world![]()