Which speaker is better

Just me 2 cents... I love the Guarnieri Homage... I find the B&W not enough revealing... Of course this is to my taste...

Also, you should describe the electronics you will be using. It may be easier to give some advice...

Note: I don't own any of those speakers...

It depends on what you like to listen to. If it's music, the Sonus Faber. IMHO

duh...

It may be the speaker that matches whatever amp you have the best

Haven't heard the SE25, but did have the opportunity to audition the new Dynaudio 1.4 against the B&W 805 signatures. Power provided by Cary amp and pre (can't remember model #'s) and source was top of the line Cary player. For my taste, I felt the 1.4 was a better match for the Cary; though both were good. It seemed the B&W had a tad more bass extension, the dyn had smoother highs. Overall, I felt the dyn was more musically satisfying, but again, just my personal taste in sound. I seem to prefer those soft tweeters! Try to audtion them side by side, with the same setup.