Given the right amount of bandwidth digital would sound a lot better (Compare CDMA to IMBE for example) but IMO analog is best with what LMR technology and FCC constraints we currently have. With analog you don't have issues with background noise (ie., wind), you can still get something from scratchy comms, you can use DTMF tones over the air, and it's ultimately the best for interagency communication since analog radios are cheaper and more available.
Regardless of APCO-25 being an open standard you still have the cost issues, availability, and maintenance personel that aren't adept with configuration.
-Wayne