I know, but I still think he's the best Clark Kent. Christopher Reeve is and forever will be the greatest Superman/Kal-El but Cain's Clark Kent was simply superior because you could have an entire show revolve around his performance. Reeve's Clark Kent made PERFECT sense, but if you were to make a show around that performance you would hate the character after three episodes.
Won't comment on pre- vs. post-crisis continuity because I haven't followed the comics all that much (just sporadically, and most of that was pre-college, which was a while ago).
Of the Jimmys - yes, Landes' was the most appealing as an actual person (not as annoying as most of the others; more nuanced; more mature than most).
As for Cain's acting - I totally concur that he was an amazing Clark. I *loved* his Clark. Still do. Thought he was way too stiff as Supes, but part of that was within his Clark character (starting with the day he tried on outfits with his mom & was uncomfortable in them). Yes, Reeve's Clark would have been uber-annoying (though probably still appealing) were it to be a weekly occurrence. I loved Reeves' Clark first, though, and wouldn't mind a bit o' that. SO different from Cain's, but I loved it as a kid & still do. But I haven't liked Cain's acting in *anything* else, and I've seen several of his other things - an old college buddy occasionally tapes Cain stuff for me & sends me the tapes. There's not a lot to go on - mostly "nice guy", occasionally with a bit of darkness, and usually not nearly as bright-seeming as he was as Clark

But mmm, Clark

t:
Oh, and Cain was a heck of a lot cuter as Clark than as Supes, too. Partly his discomfort with the (bad, shiny) costume, but partly the way they did his hair and the cute glasses and outfits he got. Didn't like his hair slicked back. Reeve had awful glasses, though his hair didn't change much from Clark to Supes.
So far among the Clarks' business suits, I like the way Cain and Reeves and BR look the best. They all got great (flattering!) "reporter" outfits as Clark. Don't like BR IRL in suits in general - awkward at best. Don't like TW in suits in SV *or* IRL much other than the tux and the one he wore at the funeral; he looks too slick, especially because they usually do his hair all weird (it looks better messy!), and Clark shouldn't look slick IMO. TW really hasn't had a Planet suit/business outfit yet other than in the promos. Kal outfit doesn't count - the neck is wide open - but TW does wear that well! Reeve got dopey Planet suits, but that was partly the times. Reeves lucked out - I love 40s outfits and hats in general, so he had it easy in the wardrobe department :->