In general, I too prefer the solid hefty feel of a metal body. However, black plastic seems to withstand everyday wear and tear better than black painted metal. Also, in the case of the Fuji GW, I prefer the design/style of the plastic GWIII compared to the metal GWII.
I never dropped my GWIII, but in a fit of disgust, I did throw another plastic body camera across the room and was surprised how well it withstood the abuse.