I do like the Klein inks, and I liked him a lot during his brief time at Marvel, too. Something about the definition of his inks on super-heroes worked for me is all I can say, especially over John Buscema and Curt Swan.

Though I liked the art team of Swanderson the most of all of the Superman artists, my favorite Superman era is the silver age era. Overall for me, it is Silver-Age, then Schwartz-Age, then Jurgens/Byrne Age...