Consider that there's a right way to do something (R) and a wrong way (W) (based on some consequentialist version of what actually happens.) Let's say we have a pure democracy vs a fascism.
Let's consider a few cases:
A. 80% want R, 20% want W, fascist leader in majority
Both systems get it R
B. 80% want R, 20% want W, fascist leader in minority
Demo > Fascism
C. 80% want W, 20% want R, fascist leader in majority
Both systems get it W
D. 80% want W, 20% want R, fascist leader in minority
Fascism > Demo
So we can see the only differences happen when the fascist leader is in the minority opinion. This is obviously an oversimplification, because usually leaders will have far more information than average citizens. But we can fix the discrepancy in information by switching over to a Rep. Demo, instead of pure Demo, and consider 80% of representatives vs 20% of representatives in each case, and hope that these representatives are well-informed. So we still end up with these two differences:
B. 80% want R, 20% want W, fascist leader in minority
Demo > Fascism
D. 80% want W, 20% want R, fascist leader in minority
Fascism > Demo
So, if the fascist leader is so wise that he can make better decisions than a majority of well-informed individuals, then fascism could be the better system. Otherwise, rep. democracy is better.
Obviously, finding such a wise leader is problematic. People are usually biased, one way or another, based on love, children, etc. Succession tends be a problem, and a wise leader might still make bad decisions to give absolute control to someone who might not be wise because of bias or misinformation, and cause worse outcomes for his country.
Do you have a solution for the problem of succession?