It was interesting to read several of the stories (visually) that I'd heard Six read (orally). Different things about the language struck me, and maybe there is something about the horror story as an oral art form - I'm still thinking about that. I noticed that I enjoyed Running Time more when I heard Six tell it at one of his Halloween readings, but I think I got more out of Passion Play the second time around, reading it.
My favorite story was The Catalog, which I had not encountered prior to picking up the collection, and which took me completely by surprise. Touched a nerve, that one. I also really enjoyed Wedding Present. I'll stop here, you should be allowed to find your own favorites, while I could happily praise each story individually for its various merits...