At one point I had a Durst L54 (condensor only) and a L1000 with colour head side by side. When adjusting contrast, prints from the same negative came out almost identical. The grain was no snappier from the condenser but in fact looked slightly larger und a wee bit less sharp under a loupe which I suspect is caused by diffraction of the direct light on the grain-pattern. But as you can read in Barry Thorntons Edge of Darkness, bigger grain can make for the impression of a snappier picture.
In the end I sold the L54 and switched to the diffuse light source entirely as it meant a lot less time wasted on spotting.