The volume control is better on Sonos as the Denon has a slight lag in the volume response with the iphone app kind of like a fader

About a month ago, I was offered a free Denon

Loved Denon products for years, and my DRA700 still works

The Denon has bluetooth and better Bass than the Sonos but the Sonos wins in ease of use and number of different music channels to choose from