I am beginning to think, considering road/gravel, straight pull, hubs, that the DT 350 is actually DTs best hub all around. Yes, the 240 and 180 are a little lighter, and the 180 has ceramic bearings, but the weight difference is small, and ceramic bearings are of questionable benefit anyway…. Considering that big part of the weight difference is due to the 240 and 180 using smaller bearings in the hubs for the most part (freewheel body bearings are the same size), it is likely that the 350, with its larger bearings, will have less rolling resistance, and longer bearing life, as larger bearings will be faster and last longer. Of course one could always outfit the 350 with ceramic bearings aftermarket as well once the OE bearings start going bad (which IME takes a long time with the 350 hubs).
I just do not think the small weight difference is significant at all, and the larger bearings have got to offer benefits, what do others think?