roadster: I've reported these, and a couple others, to RadioTime (the providers of the Guide). You can always do the same, and we encourage it.

Mark Grimes: Most likely, each app is using a different stream. Radioshift Touch is using the MP3 stream (or one of them) for any and all stations, while WunderRadio may be using another streaming format. Audio playback of the same stream in the same format will always sound identical.