Strange enough, it seems very much market focused: the main selling business is in Germany, which is also still heavily focused on 30 mm size. In France, exceptions is (deleted).
But in shows and competitions in France, Spain, Holland, UK, USA, Belgium, 30 mm size is very very minor, as most flat are larger, 54mm up to 160mm and busts and made of metal, or resin, but most sellers are also located in Germany.
But my view may be disorted as only perceived thruogh exhibitions and shows, or compétitions, fewer seen or visited in Germany and much more in France, Belgium, Spain which are preopably also icbergs above the sea.
Success of the two ranges should not be measured as what was painted in the past, but the number of flats painted each year since maximum five years, and even sellers are not reliable as there are(like me) collectors of unpainted figures. I speak about figures painted nowadays per year in the countries (few said about italy, for example, .... or Scandinavia...)