One of the very best Next Generation episodes and an excellent review by MEG. If I had a daughter, I could hold up Yar's behavior as a model of courage, poise, and compassion. She really does shine under those difficult circumstances. I would have no problem serving under her command.
As for TOS: I think CotEoF is a masterpiece even if Harlan Ellison thinks that Gene Roddenberry "muffed it". TOS's "The Alternative Factor" was just so-so, in my opinion.
@RandyS: Please elaborate on your opinions about these episodes. Perhaps I'm (we're) missing something.