Xtol and DDX are both good choices for maximum film speed with delta 3200. Many photographers who use this film are hoping to get film speeds above 1000 asa, the film's nominal speed. In my experience with this film, testing numerous developers, rating above 1000 asa and extending developing time does not bring up the shadows proportionate to the highlights resulting in an overly grainy, high-contrast, difficult to print negative with blown out highlights. This problem is exacerbated by the fact that most low light scenes have a tremendous subject brightness range. For these reasons I prefer delta 3200 in a two bath compensating developer or in a stand development both of which will give you all the shadow density that your exposure will yield. BTW...choice of developer has no bearing on how "rich" the blacks in the print appear (excepting excessive developer fog and/or staining).