I just finished reading "The Glass Menagerie" by Tennessee Williams, which was fantastic. Very haunting. Which is kind of the point of Williams's work. Even down to the stage notes, everything in "The Glass Menagerie" is meant to portray a specific feeling. Music, lighting, even projected captions all create a sense of memory.
Also included in the edition I was reading was "The Catastrophe of Success", an essay by Williams about how the success of the play changed her life and the reflections it has led her to.
I like essays. They're brief, and eloquent in their brevity. I also like plays. They also tend to be quick reads, and serve to portray a brief period of time very accurately. Particularly the feel of the moment, which can easily be lost in a different medium.
It's hard to tell which work I enjoyed more. The play has a darker feel, whereas in the essay, Williams is speaking directly to the reader, informing them of her opinions and their causes. I would highly recommend both.