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The best way to tell the difference is to try both and compare results
check this site http://help.chaosgroup.com/vray/help/200R1/examples_GI.htm
It has good examples of using different engines, including the time it takes for both render.
For me, irradiance map and light catche together do wonders!! That's after years of trying different settings. They provide good results inreasonable timing.
Brute force - this is the simplest approach; indirect illumination is computed independently for each shaded surface point by tracing a number of rays in different directions on the hemisphere above that point.Advantages:
Disadvantages:
Light cache - light caching is a technique for approximating the global illumination in a scene. It is very similar to photon mapping, but without many of its limitations. The light map is built by tracing many many eye paths from the camera. Each of the bounces in the path stores the illumination from the rest of the path into a3d structure, very similar to the photon map. The light map is a universal GI solution that can be used for both interior or exterior scenes, either directly or as a secondary bounce approximation when used with the irradiance map or the brute force GI method.Advantages:
Disadvantages: