The first season of ADVENTURES OF SUPERMAN with Coates as Lois Lane, is by far my favorite. Noel Neill didn't do it for me at all.
SMALLVILLE would be second, especially for the first 3 seasons which I think were extremely strong. It also has the best live action Lex Luthor we've ever had on screen.
LOIS AND CLARK: THE NEW ADVENTURES OF SUPERMAN is third for me since it's what I grew up with. It's still a fun show to watch and Terri Hatcher plays a fine Lois Lane.
Everything else comes after those. I still have yet to buy the SUPERBOY DVDs, so I've only seen an episode or two- didn't care for it. I'm also not counting the fleischer toons (which are amazing) since they were played in the cinema.