I also prefer the dual cue and find it to be much more precise than the single cue. They provide the same information, just a different presentation. On the dual cue you simply put the airplane symbol where the roll and pitch cues meet.

I admittedly might favor it because it was he first flight director I used (on the jetstream 31). I used it again on the DC9 a few years later. When I have been able to select it, I always chose the dual cue over the single.

The airplane I am training in now has an entirely different flight director - two circles, one slightly larger than the other. The instructor says "make donuts". Don't really care for it on the PFD, but works ok in the HUD.