(Cross section of front of mesh)
For a voxel model, which is the best way to build the mesh? Should I keep faces together like the top example, or cut them up like the bottom.
From the little information you provide and assuming you are after performance, it seems like it’s a question of trading vertex count for overdraw. Without further information, there is no general rule on what’s better since it depends on so many factors (application setting, target platform, performance envelope, …)
Additionally, what is your metric for “better”. Better as in “performs faster”, “is visually more stable”, “makes me sleep better a night”, …