I haven't run a DUI distributor so I can't really say first hand if its much better than the CRT. from researching both there are some differences. DUI runs their own custom module with longer dwell time, CRT runs a stock G.M. module, you can buy the dui module from summit for 50.00. the vacuum advance is non adjustable on the DUI, you give them your motor specs and they set it for you. the CRT is adjustable and should work ok out of the box but needs to be adjusted for peak performance. they both claim a 50.000 volt coil. both appear to be well built and should work fine for many years, I and others have run the CRT dizzy for over 5 years with 0 problems.
personally I'm happy with my CRT distributor but I'll probably buy the DUI module just to have it on hand when mine finally goes bad.
Do everything with a positive attitude, it won't always work but you'll piss enough people off to make it worthwhile.
the voices aren't real but they sure have good ideas.