The original versions are old favorites, despite the audio problems in some of them. I've listened to most of the Penguin versions. Some are outstanding, like Pyramids, read by Andy Serkis. Most of them are pretty good.
But a few are so terrible I can't bear to listen to them. Like Hogfather, read by Sian Clifford. She read the wizard voices in a falsetto to scratch glass. And Katherine Parkinson absolutely laid waste to Monstrous Regiment with her appalling rendition of Jackrum. So clear she Just Didn't Get It.