I recently started to use an enlarger with a diffuse light-source after several years with a pure condenser (Durst L54).

My conclusion so far is that both have their applications. If sharp grain is what you are after a good (!) condenser has an edge <g>. My snapshots on Tri-X simply have more snappy grain and appear sharper when enlarged with the condenser. Otherwise a diffuse light-source is easier to work with. I haven't found any pronounced differences with respect to better tonality besides a 1 Grad difference so far but keep looking. It is to early to draw any further conlusions.