DSD and DSDPlus both good, but sound quite different..
One thing I've noticed is that the recovered P25 Phase 1 audio sounds quite different between DSD and DSDPlus.
Try this yourself and toggle between the two decoders while listening to the same channel/traffic.
I haven't found a way to route SDR# audio to both decoders at the same time yet and even if I did, I would then have to find a way to separate the recovered audio into stereo (left and right channels) to be able to compare in real time.
IMHO DSD gives a nicer mellow sounding recovered audio with good/better bass response, whereas DSDPlus produces a somewhat more harsh sounding audio with what appears to be more emphasis on high frequency audio response and less bass response. I also think that DSDPlus seems to be emphasizing transmit background noise more too (bit of audio compression going on somewhere?) but I need to spend more time listening and comparing.
For info, In my setup, I get excellent decode with little if any error/breakup with both decoders (albeit with DSD running in -fg mode) and at this point in time I'm leaning more towards the DSD audio, as it just seems more realistic and easy to listen to.
Regardless, fantastic work whoever put the time and effort into DSDPlus..
Things are getting very exciting in the SDR/Digital radio world