I enjoyed TSW:CSX a lot. I did eventually grow weary of the long hauls, wishing there was more opportunity for switching, and that Cumberland yard didn't look so empty (other than long unit trains).
Maybe it's just the newness, but in GWE I'm much more enjoying the trackwork, the positioning of the passenger trains from depot, the frequent stops and starts.
The early low sound issues are gone - either they were fixed, or the temp fix outlined in other posts has stuck (I had the impression that it had to be re-fixed for every scenario).