Well it’s kind of leading question on a L&C fanboard..
For me, Lois and Clark takes every role with the possibly exceptions of Smallvilles Luthor but I haven’t seen much of that show but I liked the added depths, then again I really enjoy Shea as the megalomanic Luthor, talking to his dog about how great he is. Luthor in the movies did nothing for me. They are just angry and evil just because. (Just as Superman is nice and good just because).
Now many doesn’t like Dean Cain’s Superman. They think he is silly compared to Reeves august portrayal of him. The thing is though that they play different supermen.
Reeves classical superman can juggle worlds, turn back time, has the entire science of Krypton accessible and has an IQ that makes Einstein look mentally handicapped. He is Superman perfectly content with protecting a species immensely inferior to him in every imaginable way, for some reason with a fetish for the American way.
Now the L&C Superman doesn’t enjoy being separated from humanity, because he has struggled his entire life to be one. He doesn’t want to be treated differently yet he is forced to become Superman because can’t just sit and watch when he so easily can alleviate the suffering of this world. He is the reluctant hero, afraid of power and alienation, that’s why he plays with children, acts goofy and doesn’t care to project an aura of majesty, he doesn’t want humanity see him as an alien or a god. While the classical superman is a Kryptonian first and foremost and has no problem with detachment and being different.(Making Clark Kent a meaningless shell.)
This is also what makes the Superman Lois love story work, if he is a content product of a immensly superior civilization with a towering intellect what possible interest could he have in Lois Lane?
It's like a human male interested in a female monkey.
So therefore it's a matter of which Superman you prefer. I prefer Byrnes because it gives Superman enormously more depth. The latter also explains the suit much better since it’s silly not majestic, a statement that Superman despite his godlike powers are not to be feared.
Like in the exchange with Vixen:
I'm impressed -- although I don't understand the blue suit. It's not very intimidating.
--I'm not trying to intimidate.
When it comes physique I also prefer Caine. Many complains about his length and he has been called midgetman, sure he is isn’t towering over people (then again I never felt that he was short either), but he has supermans proportions. If you see the comics Superman has the mass of a refrigator taller then most, and just as broad, a Schwarzenegger, Mr Universe like build if you will, this Reeves and Routh lacked, they look like maypoles. To me it’s make them look wimpy. Coupled with their beauty even effeminate.
Caine OTOH moves like a wrestler or footballer a man that carries a serious frame. That is more Superman to me then simply towering height.
Caine is also the only one that been allowed to play Clark Kent instead of a bumbling caricature so it’s just impossible to compare that role.
And of course Terry Hatcher simply nailed the role as Lois Lane. She is the benchmark. None else have ever come close IMO.