I auditioned both the
2018 600 series Towers and the Silver 500 and 300 (also Martin Logan Motion 40 and 60 XT(?) (forgive if I have an imprecise model number)).
I found the Martin Logans and Monitor Audios to far exceed the B&Ws in performance.
Frankly, I didn't really care for the 700s from B&W. Perhaps it was expectation cos everybody built B&W up to be an amazing standard...
I just really do not care for the B&W house sound. (That said the Stereophile measurements for that model look much better than others from B&W, though there are still some flaws)
I think I saw somewhere that they are making some changes, but my knee jerk reaction would be to move on from B&W.
I prefer a much more neutral and accurate Speaker. On the other hand, you may be very used to that sound and it may be an awkward transition away from them.
At least in 2018, the Silver 300 was very impressive. The newer generation seems to be reviewing well, too. I also tend to favor a 3-way design over 2- and 2.5- way Speakers. (While it is true that a good 2-way can outperform a mediocre 3-way, a well designed 3-way will win the day over anything else when it comes to presence in the Mids.)
Depending on your habits and program material... I kinda want to recommend something completely out of left field:
Check out the Philharmonic Audio BMR Monitors.
www.philharmonicaudio.com
After my auditions in 2018, and with Monitor Audio Silver 500 being my favorite, I heard Dennis' Speakers and was blown away. The BMR Monitors can hang with many towers, even, and punch well above the price point.
Other than that... I would lean heavily toward the newer MA Silver 300.
Happy hunting!