Part of the reason I personally enjoy TNG so much is because the episodes are varied. Each time the crew encounters a species, we learn more and more about it, and then sometimes we are left with loopholes/cliffhangers/etc. It keeps me coming back, even though I've already seen the episodes. I do have to say, even though this wasn't one of your options, I really enjoy the episodes that elaborate on Data. He is one of my favorite characters from TNG, and I find him quite adorable!