I have used both the software's 2-3 years back, In my personal openion CDAX interface is very good at catching the eye of the trader specially in highly trading stocks in volatile market. But in DFN you can hardly identify the highly traded stocks, unless you are specifically keep your eye on the particular stock. Only good in DFN was the more stability than CDAX.
I havent use DFN from recently. Is there any modifications or simply the same as it was ??