I find it a bit bizarre they even mention high and low capacitance on a digital interface cable. Assuming both are 110ohm cables, the high capacitance cable MUST have low inductance and the low capacitance cable MUST have high inductance. This comes from the relationship of Zo=sqrt(L/C), or characteristic impedance is equal to the square root of inductance over capacitance. Controlled impedance cables like this are made to maintain a delicate balance of inductance and capacitance, and when used in a properly terminated system, the impact of these reactive components pretty much goes away. Well, that is unless you are stringing hundreds of feet of this stuff. The higher capacitance cable would probably have more loss, which would translate into rounder edges on the pulse train going to your DAC. This has the possibility of inducing greater amounts of interface jitter into your system. Then again, one of the beauties of the differential nature of AES/EBU is the inherent noise immunity, which begs the question of why additional shielding is needed in the first place?
I'm at a loss as to what effect capacitance will have in that application. Sorry. 