A. Al Gough and Miles Millar (Seasons 1-7)
B. Todd Slavkin and Darren Swimmer (Season 8)
C. Kelly Souders and Brian Peterson ( Season 9-10)
Al and Miles years were decent, even though some plotlines got tiring, they're nostalgic
Todd and Darren were responsible for Season 8, the worst season. Coming back after the writer's strike with 4 cast members leaving they started out strong, but abandonded the show mid season for the new Melrose Place, leaving Kelly and Brian hanging not knowing where they were going with the direction, resulting in a lackluster tail end of the season.
Kelly and Brain ramped up the Superman mythos and actually showed Clark's progression.
As much as I love the Al and Miles years, I think Kelly and Brian were the ones who "got it."