Thank you.Personally, if I were looking for an AVR, I’d buy an AVR due to the support for a wide range of video and audio codecs.
If I already owned an Ultra or Amp Pro, I’d consider adding WiiM’s Dolby digital feature for occasional watching of movies.
Another option might be to use an AVR and feed its rear output into a WiiM Pro (or even a Mini), and group that with a WiiM Amp (or Amp Pro) for the rear surround so you can get wireless connection to rear speakers and arguably get the best of both worlds. When not in use for the back speakers, the front Pro could feed into the AVR for stereo playback of all the music services it supports.
I'll give it some more thought as I'd like to keep the system simple due to installation space issues.