It may even be a matter of preference, but there are important advantages to using Quads when creating your models. Not that I'm wrong or the end of your model if you use both. When prioritizing quads instead of tris, you have advantages such as: the model's wireframe will have a clean appearance, which will make navigation and editing easier. When using Quads a fluid mesh is created, much easier to follow its geometric evolution through the model. It is much easier to convert a mesh composed of quads to triangles than the reverse. There are basically only three types of polygons that really matter: > Quads (Quadpolys or Quadrilaterals) The "standard" polygon, most used and balanced, composed of four edges (edges). > Tris (TriPolys or Triangles) The simplest polygon, composed of three edges (edges). >N-Gons Polygon consisting of five or more edges (edges).