tj@
i think both the ways are ok ,i never tried the nathiagali one , but as per google earth , it seem more exciting and harder as well than muzaferabad one , in this way we have to use KKH after abotabad which is known for its heavy trafic other than twisting road of nathiagali , on the other hand MZF road has low trafic density but essentially requires carefull driving after express way.
here is the areial view of both the roads
