With standard illuminations shadows have a tendency to look 'flat', an almost uniform gray. With GI, shadows get more life, more color variation. I almost always use GI for rendering, haven't done any tests with GR yet (a GI render already takes several hours, I don't want to know how long a GR render will take....)

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

My gallery   My freestuff