Since a few decades, various approaches, techniques and software have been developed to model easily and quickly the 3D structural geometry of subsurface. Among them, some use an explicit representation of geological interfaces while others are based on an implicit one. Several works tend to promote one approach against the other. In this contribution, we suggest that both approaches are not mutually exclusive and can be combined in the same study depending on available data and on the type of geological features to be modelled. This is demonstrated through two examples that aimed at modelling geologically complex areas: the abandoned coal mine of Merlebach (Lorraine, France) and a minibasin in a salt tectonic context: Inceyol (Sivas, Turkey).