On the Roman Pontiff, vol. 1: Books I-II (De Controversiis)

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cited in these Christianity StackExchange answers

Why Monarchy ≫ Aristocracy:
St. Robert Bellarmine ends his ch. II ("Why Simple Monarchy is Superior to Simple Aristocracy") saying (cf. vogons ☺):

Lastly, to the extent that in great households, where many servants are assigned to the same duty, they manage their business badly because one shall leave behind a common duty to another: thus even where there are many heads of state, one looks to another, and while each one throws back the burden on his colleagues, no one sufficiently employs diligent care to the state. A king, however, that knows all things depend upon himself alone, is compelled to neglect nothing. And also, hitherto, it is indeed proven that simple monarchy is better by far than simple aristocracy.

See also his question on whether the pope can be a heretic (ref:1.1808): De Romano Pontifice , Book II, Chapter 30

cf. the contra Rager articles by Grant in CFN (audio of both parts)