My experience with client dogs has not shown me that altered males are any easier for the average person to handle than normal ones. *shrug* Most people can't handle dogs, period, and I've not seen that there's a huge difference between alters and males - certainly not the behaviors that really matter to pet people.
I have had a couple people ask me if they "should" neuter their adult dogs. I just ask if they're unhappy with the dog now, and does the dog roam unsupervised? If both answers are no, then I recommend they save themselves the $300, lol.
AFA the zuetering goes we have a dog at work that was done this way... no idea if he was part of trial, or something? I just remember we had to call the owner because she marked "neutered" on his paperwork but he clearly had nuts. He still looks intact structurally (and no, I don't mean that he has visible testicles), so that's nice. He does like to mark and still acts generally "male".
I've read that the injections halve testosterone production, so it's not something I'd do for my dogs, but seeing that the dog done that way at work looks/acts normal, I'd consider it if I were in the position of altering a foster dog before rehoming, or something.