A neutered male, like a gelding instead of a stallion, is often (not always) less dog for the pet owner to deal with.
If the bad behaviors of the dog are driven by the dog being a stud-brain, I think this is absolutely true.
My problem is that I think it's unfair telling people to neuter or spay their pets as the sole answer as to how to manage dog aggression. Because I suspect what happens is they spend that money on the surgery, and then find out they have the same dog with the same problems.
I think some dogs just don't like other dogs getting in their faces or touching their stuff. Some of that is caused or exasperated by stress or even excitement. Whether they are intact or not.
A reasonable non-aggressive behavior would be what I've experienced when Jacks has had quite enough playtime with Bertie. One low growl and the pup immediately backs off.
How that could escalate or turn into something terrible is if you put a dog in a situation where he feels harassed and a low growl or even a variety of other subtle warnings do not make another dog back off and leave him alone.
With other dogs or something I've observed too is that their way of communicating is what is 'allowed' by the owners. That's whether the dogs are intact or not.
With the one dog we had neutered (when he was pushing 10), fwiw, the one behavior change we saw was he no longer had any use for the usual "exchange of information". So while in the past he and his brother would do the usual personal area sniffing/licking as a matter of course - after his surgery, he would growl or snap at his brother if he so much as got a sniff in the rear. Because neither dog had an aggressive bone in their bodies, the growl or snap worked. <- But again, I imagine it would be vastly different if Sammy snapped at his brother and Danny continued to harass him.
Beyond that - we did not notice any other behavior changes. Sammy still went out and marked. He still had the senioritis issue where he gradually forgot his borders and would wander if we took our eyes off him.
For the surgery they had to shave off his trousers and even a portion of his tail - and I remember how astounded we were by how quickly and thickly it all grew back. His coat always was too silky and prone to matting, so we didn't notice a texture change. But I've talked to a lot of breeders and obedience people (goldens and other breeds) who delay or avoid neutering/spaying their dogs primarily because it ruins the coats and makes them difficult to maintain.