I've only listened to the BBC theatrical audio version. I'd like to see a regular narration. Holter Graham did an excellent job with Christine. I was impressed. Steve Weber did a memorable reading of IT, too. That one is a challenge because of the requirements of doing different voices (Richie Tozier) and other characteristics.
I just heard a few days ago that Simon&Schuster Audio has acquired the rights to do the audio version of the book but I don't have any information on a production schedule. This will be a straight reading of the entire book rather than another radio drama version as was done previously.