Seems to me that 2 runs of CCA does indeed beat 1 run of OFC in terms of capacity/loss etc... price will be debatable as there is always someone that says "I got my 20 feet of XXX wire for less than you listed" (that argument will be made by both sides to prove their points about cost effectiveness.
Honestly, did anyone expect less runs of OFC to beat more runs of CCA? (assuming same size cable). But.. at the end of the day, the differences are really only relevant to those chasing tenths on the meter. You will not hear a 75W difference going to your subs when you are talking about running more than 1kw, let alone 3kw+... You will also not hear the difference of .15VDC... Your car will not care about the extra weight of the extra run of CCA... Your wallet will not likely care that you spend $30 for dual input + $80 for a spool of cable + a couple of extra terminals instead of spending $170 on a spool of cable.
If you are chasing tenths, then break out your calculator and your wallet and run whatever cable setup that will meet your current carrying needs, whether it be CCA or OFC. There are some loud mf'ers on here that run CCA and they aren't wrong for it. There are some loud mf'ers on here that run OFC and they aren't wrong either. If your cable's capacity exceeds your system's draw, and your voltage is solid, you are probably doing it right.
If you are not chasing tenths, then estimate what you need, and buy whatever you get the best deal on (or whichever will please you the most to install/look at/brag about etc..) because you just won't hear the difference.