Hello, so I got…the BS2 !
And the why’s are not going to be very impressive unfortunately.
In terms of looks I prefer BS2 except that Balance (marble) was winking at me so much. From what I have read on the forum, have heard from my 2 emerges, and since I do not think I will need to stereo pair in an immediate future and finaly am not a specialist, I realized they were both going to be great in terms of sound. The argument of clarity (BS2) versus warm (Balance) seemed OK also.
Then i stumbled upon that offer online with 20% off for both products, which happens to be quite a good decrease in price. Since i could not find a way to go quickly to a store to check things out, i had to figure it out based on where to put which color in the flat before the sale was unavailable.
It happens that BS in grey fits better, so that is what i chose.
I have received it this morning, the sound is terrific for my taste (the bass : wow), and the look is quite satisfying as well.
I will really have to learn much more about sound in the years to come to make a more educated choice.
Thank you again for all the insights.