Hmmmm.... The easier ones first, the harder ones later, as they occur to me.
"New Eden" (DSC) -- This is a planet-of-the week episode through and through. A very good one, but not normally what Discovery does.
"Preemptive Strike" (TNG) -- One of my favorites. Ro is sent on an espionage mission to infiltrate the Maquis and stop them dead in their tracks. Eventually she gains sympathy for them and it doesn't take long for her to see things their way, especially after an elderly Maquis, who dies later, takes her under his wing. Picard catches onto this at one point and sends Riker to go along with her to make sure she follows her orders. Then Ro turns on the Enterprise and tells the Maquis about Picard's plan to ensnare them. Riker makes it back to the Enterprise but, before he does, Ro lets him know she finally found where she belongs and regrets having to turn on Picard. At the end, Picard just stares blankly out into space. This is really a DS9 episode that's just barely in TNG drag.
"Prodigal Daughter" (DS9) -- Ezri's home life and O'Brien gets mixed up with the Orion Syndicate. Not exactly the type of episode you normally see.