Okay, this will be tough, and you'll need your calculator, but here goes.
You need to have the following paramaters for each cable, you amp, and your speakers available.
Frequency = F
Resistance = R
Capacitance (picofarads) = C
inductance (microhenries) = H
Pi = P
Watts = W
Volts = V
Current = I
Looks = L
Cost = S
using the above mentioned symbols for the parameters in question, the equation will be:
1 = (1/2PFC)<sup>2</sup>*(2PFH)<sup>2</sup>*(2PFC)<sup>2</sup>*(1/2PFH)<sup>2</sup>*(LE/RI)*(W/SEI)
After looking at this for a while, you'll notice that it all cancels out except:
L/S = 1
That should help you make your decision.