Wilson Wat Puppy 7 or Avalon Opus Ceramique?

Hello, I have the opportunity to buy an used Wilson Audio watt puppy 7 or go for an Avalon Opus Ceramique. Which one to take if you live in a flat ie. have to enjoy music at rather low volume, want very good dynamic and lots of soundstage? And in case of the Wilson, which integrated amp would you take? Cheers and thank you, Mike