I'm not advocating their system, but here's one pro for China obviously.
Also, China can lobby indirectly through media manipulation, and relatively cheaply disrupt our already clunky-feeling Democratic governmental processes.
Dictatorships work as long as they're benevolent, much like democracies work as long as they aren't bought.
China doesn't have flip-flopping like this with its attendant massive waste. Instead it has endemic corruption which siphons off funds all over the place, perhaps with the exception of the big projects that command the full attention of central leadership.