I don’t think certain brands I can think of release their sales figures. So almost impossible to work out.
But ‘out in the real world’ I mostly see people wearing quartz watches mostly Casio, Seiko with some type of bezel or chronograph function. And now more predominantly ‘smart’ watches, also produced in the Far East.
I do question the assumption that you make that the majority of watches on fora are dive style? Check out timezone.com. They have whole sub forums by brand such as Patek - not many dive watches there? Check the watches on SC - there is a decent spread of types of watch there?