No one reasonably hires without deciding what traits are important for a role. Building a whole new division? You probably want someone with experience in the

No one reasonably hires without deciding what traits are important for a role. Building a whole new division? You probably want someone with experience in the field, preferably building divisions. Working on maintaining legacy code in a specific language? A domain expert would go far for that. It's not too hard to measure what is valuable for many roles. Beyond all that, best is relative, and an aggregate of all of your skills. This isn't about hiring "the best", it's about hiring the best that you can find. And evaluating that is totally subjective. But you know what isn't an objective measure of "the best"? If your skin looks different than mine. That's a measure of almost nothing about the quality of your character, work ethic, or intelligence.