There's more to Brock's character than that.Probably due to personal biases, but I'd pick kiawe and clemont over Brock any day
If Brock had been created more recently, many people would surely hate him for his repetitive gag and that may seem "harassing" to some people...
Plus, this comparison wouldn't be fair as Brock came at a time when Ash was inexperienced, immature, and made rash/silly decisions. One of Brock's biggest selling points is how his character evolved relative to that of Ash's. The former was initially more of the grown-up figure of the group who Ash would look up to for advice. This evolved to a more best -buddies type relationship with Brock now also looking up to Ash after his growth and change in character.
Clement & KIawe would have been a terrible fit for OS and Johto Ash.