The biggest difference I can see between the two is that the Geffen has the inputs on one side of the box and the output on the opposite side.
The Pacific Cable has all the ins and outs on the back. By ergonomics alone, the Pacific Cable looks easier to set up in most systems.
BTW, the guy I am going to use to do an ISF calibration on my set says that the RGB levels are quite a bit different for DVI and component video, at least in the Hitachi S500 series.
"As far as inputs, if you plan to use DVI, it is vital that it gets calibrated in addition to any other inputs. DVI RGB color processing is much different than component in the Hitachi. "