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From Odwiki

The "Mesh" Geometry Type

Meshes are bilinear patches. They are equivalent (but simpler) than an order 2 NURBs/Bezier surface.

They are simpler than NURBs since they have an implied basis (so are faster to evaluate and don't have to carry around their basis with them).

They are more efficient than polygons since you have a single primitive, and well defined connectivity. There are roughly 1/4 the vertices in a mesh compared with a polygon mesh of the same resolution. This means they are more memory efficient.

However, they aren't as general as polygons since you need row/column topology.

You may use the ConvertSOP to convert between NURBS and Meshes quite successfully.