Any official who wants to accomplish something substantial will prefer the Tang Empire's bureaucratic system. Here, they don't have to expend most of their energy on scheming against others.
Although, in reality, everyone in the officialdom has some sort of "competitive awareness," the difference between keeping it beneath the surface and putting it out in the open is enormous.
At least on the surface, the selection of officials in the Tang Empire places the utmost importance on competence and loyalty. If one possesses both, minor flaws don't have much of an impact.
Tang Mo used to be a merchant operating in gray areas; he cared more about the loyalty of his subordinates and their ability to get things done. This style deeply influences the Tang Empire.
