I suppose it depends really.
I've kept both entire & neutered males, but the decision for me was based on the circumstances at the time.
My entire dogs were show dogs, you can't show a castrated dog in this country under Kennel Club rules, except in very special circumstances for medical reasons. And because they did well at shows they were in demand as stud dogs, & I used them to mate some of my bitches. They weren't yorkies but a couple of bigger breeds & they didn't have the run of the house as we had specially built, fully equiped kennels.
Now I just have one male, a Yorkie, & he is castrated.
I knew that I wasn't going to show him, he's just my shadow. He lives in the house. I also have bitches living in the house, some of whom being of a breed at the top of the Kennel Club's "At risk" native rare breeds, as well as being show dogs, I have no intention of having spayed.
It would have been an absolute nightmare having my little dog living with them "entire" ....he humps them enough when they're in season as it is!
There is definately a difference between castrated & entire male dogs.
My little one had begun to lift his leg, sometimes indoors, before I had him neutered at 8 months. That stopped entirely afterwards. He's also far more affectionate & interested in me than my entire ones were.
Don't misunderstand, they were very loving & obedient, but if they got any wind of a bitch in season they were always on the look out for the main chance.
I once watched as one, small terrier, scaled a 6 foot chain link fence to reach one of my bitches in season!
And even though our place is like Fort Knox with the walls & fencing, another one was worse than Hudini as an escape artist if he thought there was any chance of a willing bitch in the village.
They could also howl like the best male voice choir
So if he's to live in the house & you've no intention of showing him, you might have an easier life with him if you have the op.
As to health benefits, I know the theory, but have to say that in all the years I've owned them I've had not one case of male cancer or other specific male related problems, & some of them lived to be 18+ years, one was 2 weeks away from his 20th birthday.