In this corner: Land of the Lost
Premise: Marshall, Will, and Holly, on a routine expedition, met the greatest earthquake ever known. High on the rapids, it struck their tiny raft, and plunged them down a thousand feet below to the Land of the Lost. It was always unclear to me whether they went back in time or it was an alternate dimension. Or something. Oh, and there are lizard-like creatures (Sleestacks) and a monkey-boy (Chaka).
Pros: Shows perils of entering time portals, something kids today are rarely warned about. Almost--but not quite--getting home in every single episode also teaches children that life is cruel, scary, and unfair, something they should really have drilled into their heads at an early age.
Cons: Chaka never sings "Tell Me Something Good" or even "I'm Every Woman," which is disappointing. Supports anti-lizardman bias.
In that corner: Sigmund and the Sea Monsters
Premise: Sigmund, a sea monster/father of modern psychiatry, is kicked out of his home for being a bad monster and for being too close to his mother. He befriends two boys, who keep him in their clubhouse. He persuades them to keep it a secret.
Pros: Kept Johnny Whitaker off the streets one more year. Teaches children to keep secrets.
Cons: Johnny Whitaker sings the theme song. Sea monsters are disturbingly phallic. Strangely fey genie (annoying talk-show regular Rip Taylor) joins cast in second year.
On balance: Typical Sid and Marty Krofft psychedelic low-budget extravaganzas.
And the winner is...: Land of the Lost
Deciding factor: Because Johnny Whitaker doesn't sing Land of the Lost's theme song.