Claire's demo idea is the best one, and the lads at Richer Sounds are boss - you'll have a much better idea of which one will suit your particular requirements.
We have a Play3 in our kitchen/diner/family room, for general music/radio listening, and a Playbar in the living room which we use with the telly. I use the 3 with a bridge, and the performance is excellent-no dropout at all, as the mesh network is so good. I also relocate my Play 3 in the garden when I'm pottering about out there, or we are having a bbq. It sounds great, and its dead easy to set up.
Both are fantastic, and the room that the 3 is in is about 1,000 sq. foot [L-shaped open plan extension] and it still sounds fantastic in there. I'm no particular audiophile, but its plenty loud and full sounding enough for me. I'd personally struggle to justify buying a 5 over a 3, because the 3 sounds so good.
The Playbar is great with the telly, but we also use it for general listening from time to time as well. Again, the sound it produces is fantastic.
We use the Sonos stuff with Spotify premium, and haven't bought any music for over 2 years as a result. Absolutely love it, and the free ipad control app is great as well.