If it's any help, I have a 36-hole Shimano DH-3N72 and am very pleased with it and wouldn't hesitate to buy another if needed. At the time I purchased it the choice was between this, the Shimano DH-3N80 and one of the SON dynamo hubs. I selected this one in particular because it was significantly cheaper than one of the SON hubs and the 36h version was in-stock unlike the 36h DH-3N80 which would have had to be ordered.

If I were to purchase now though I might give a closer look at one of the Shutter Precision hubs fietsbob linked upthread.