TNG... Seasons 1-2 are one vibe, seasons 3-4 is another, and 5-7 is the last vibe.
Personally I'd split TNG into Season one being it's own thing. Season 2 being it's own thing. Then Seasons 3-5 and then Seasons 6-7.
Because Season 1 was very awkward, Picard was an absolute asshole and hated everyone, but it also had this weird, exotic vibe about it that was absent from all other seasons.
In Season 2 the characters were a lot better and the show started to shift into what it would become, but the exotic vibe from season 1 was gone. It was also the Pulaski Era.
Seasons 3-5 were the hayday of the show for me. Picard was finally the character he's best known as, the other characters had mostly found their places too, Dr.Crusher was back and there were a lot of good stories.
Season 6-7 then were TNG in its decline, when it eventually devolved into Season 7 and early 90s beige. But it was also the era when they finally started to get the hang on Troi's character, put her in a uniform and she got episodes like "Face of the Enemy" .and "Thine own Self"