I'm am by no means an expert and can only offer you my opinion on the Sonos equipment. I have Sonos in my home and love it. For my needs it is perfect, simple and works flawlessly, but I think your decision will really come down to what YOU want to do with the system.
For me, local MP3 files, Spotify, Pandora, SiriusXM, Last.fm and internet radio were my only sources I was looking to play in my home. I didn't need or want to control any other sources in a central location. I didn't want an intercom system and I didn't care about sending a source from one room (not centrally located) throughout my whole home. With all of that being said, it made Sonos the right choice. As you start adding those needs or wants into your system you will probably find that Sonos may not be the right choice.
You need to decide what sources you will want available in what rooms and how you want to use the system to really find out what system is best for you.
Also there are plenty of threads on the site already that talk about the various systems. You might want to do a search and read some of them to help get you up to speed on each systems pros and cons.