I own B&W D3 speakers, but I really like the sound of Sonus Faber when I have heard them. McIntosh room at RMAF 2018 had some Sonus Faber bookshelves that sounded really special. However, Sonus Faber with their soft dome tweeters is just a little laid back in the high frequencies. Pairing with a laid-back McIntosh amp didn't give me a fast enough sound, but it still sounded very good.
In my opinion the B&W is likely going to be a better pairing with the McIntosh amp if you want a faster and more exciting type of sound, due to the diamond tweeters. It depends on what kind of sound you're after.
Even though I can really appreciate the Sonus Faber, it's still just a little bit too laid back in the highs for my tastes, even with a high resolution amp.