You may be interested in
1. Primary Use - If the system is mainly used to Fence your landscaping or define property boundaries or you were containing pets or protecting property, you may be able to use a lighter mesh.
2. Visual Aesthetics - If you desire a fence system that in harmony with the environment then you should consider a color coated system.
3. Potential Stress - If there is the potential being climbed or leaned (by dogs) on the fence you may want to consider a heavier mesh than normal.
4. Longevity - If the system is to remain for many years, be sure to consider the finish coating of the mesh. The color coated meshes have a long life expectancy, holding the appearance from rusting.