[Tuor of Gondolin]

It will take some thought to make a more reasoned
analysis. off hand, the various aspects of Narnia
(rulership?) seem to be, as noted above, variants
of benevolent dictatorship--- with apparently no
noted dissension or rebellions. Middle-earth,
or the other hand, is interestingly varied, and more
in tune with the history of humanity. You do have
non-regal societies (Laketown, and the Shire)
and even more interesting, M-e peoples get
dissatisfied for various reasons and seek to change
their governmental organizations. And even Gondor after
the War of the Ring requires at least a pro forma
ratification of Strider's kingship. Much of the cause of
strife in Middle-earth, indeed, seems to come from
human restlessness and interest in change
(often just for the sake of change, even Numenor
not being exempt).