A very good source of info about a lot of the powers and incentives in something like this is the “rules for rules” youtube video from cgp grey https://youtu.be/rStL7niR7gs
I don't see the semi-functional United States outcompeting dictatorial slave labor economies. If your metric is how much value you can offer to huge multinational companies, it's plain that democratic societies are completely rejected and not even in the running.
'your investors' may very well demand completely inhuman behavior, because there's a cost to humanity, ethics and decency. If you insist on being decent and the flow of capital is completely frictionless it will all bypass you without a second thought. You will be actively choosing to not be the lowest-cost, highest-return option.
I guess I would just encourage people to look at where multinational companies tend to be created, tend to be headquartered, and tend to get most of their revenue.
A lot of Singaporeans might disagree there. Enlightened dictatorship can be really good however the probability of a having a great dictator is extremely low.
That's correlation, not causation. A lot of the "best" democracies were functioning well before democracy arrived. The main issues that make countries "bad" (bad blood between groups, mistrust of authority, warlords, force majeurs, etc) are not directly related to the form of government.
Just a book recommendation, but for people interested in learning more about these kinds of situations, I'd really recommend Amy Chua's "World on Fire."
Having acknowledged that central point, we can't just say "dictators are bad". We can say "democracy is better", but there are instances where democracy doesn't work.
For a realpolitic example, great powers have a long history of quietly corrupting and overthrowing democracies where their interests conflict with our interests. It might be that a country has their democratically elected government toppled by the CIA/Russian version of the CIA/Chinese version of the CIA and then ends up as a dictatorship.
It is far too simplistic to then say "well, the dictator is at fault". Maybe the dictator isn't very nice, but there are political realities to attend to.