The thing I like about Belgian best-grade guns is similar to American bests. We were not the kingpins that set the standards of excellence in style when these guns were made. As such, both American and Beligan aesthetic was catering to the English styling until they both evolved slightly on their own based from that basis.
Put another way, Belgian guns look British and avoid the typically gaudy and ostentatious look of some germanic weapons. Rose & Scroll, Acanthus leaf, vines, foliate, dollar bill, green knight, fleur-de-lis, whatever the styles they are all very understated and dignified, even if slightly louder than a British best gun.
I'd take it any day of the week over the proverbial zoo of dogs and stags and grouse and acorns adorning most german guns, or ducks and pheasants shaped like bowling pins on the Spanish weapons. Just a preference.