The thread title is a bit confusing to me because I don't remember pondering this question, as I remember it, TNG has always been the winner. 

"Duet," "Trials and Tribble-lations," "The Visitor," "Little Green Men," "In the Pale Moonlight," "Far Beyond the Stars," "It's Only a Paper Moon."
I don't think dark is "in vogue" so much as it is where culture is at.
^ so you’re problem with episodic television is that it’s episodic? If you’re going to compare apples and oranges, compare them as fruit, not each against the appleness or orangeness of the other.
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