I do a lot of Marantz, been doing Sonos due to the initial problems I heard about with HEOS.
With Sonos fubarring their UI with the recent update I am thinking of revisiting HEOS.
It would be nice to have a smoother way of integrating the house audio into the surround zones. I have done a few Sony ES+ Sonos surround zones.

Everybody else gets Crestron Sonnex, NSPs and I have rolled a few Sonos Connects in here and there. I do miss the CENTRAK and AM/FM/XM card. Having instantly available, always on music is super handy in many situations.