I feel firberger has it spot on with the auditioning "show-off' nature of some speaker sound, and know I'd eventually walk away from the B&W revealing tweeter sound. Sonus Faber can be a bit less 'sparkly' but you may not get an ear-ache either. :-)
Which one will make you sit down and not want to get back up in two hours? I want a speaker with detail as well but if it must stray a bit, better warm and listen longer than cool and leave the room room of fatigue. (Kudos to ears that can listen to diamonds.)
That said, I do still own and like my old DM-302s from 25 years ago although they're not set up.