If you like it loud then the B & W for sure. The midrange driver on those Monitor Audio speakers are too small and not powerful enough for loud.
Neither of those choices are particularly good choices.
For its price the B & W measures very badly.
For a speaker costing that much, that is a total and complete disgrace!
The Monitor Audio is nothing to be proud of either.
That speaker is going to be a bit of a boomer. It has a peak right at the "boom" frequency, then the bass falls like a rock. I don't know how, but they clearly have managed to mistune it. In this day and age that is inexcusable. The tweeter is suffering break up as early as 10kHz.
Unfortunately there are far more bad speakers than good ones still. Price is no guide as to whether a speaker will be any good. There are plenty of dreadful speakers that cost a fortune. It is no good asking me what I use, as I design and build my own, and with good reason. I would never be proud to claim I designed either of those.