comparison of different dedicated AC line types?

It's an AC line. Nothing special is required. 12 GA should be fine unless you have very large amps. An AC power line is a noise source, so it is silly to shield it.
The whole point of an audio equipment power supply is to stabilize and clean the power to the electronics. If you have adequate current carrying capability, you are fine.

Speaking from experience with a friend who went through numerous steps upgrading his dedicated AC line, solid core is better than stranded. Improvement achieved going to !0ga replacing 12ga, and additional improvement going to 10ga Cryo'd Romex from VH Audio (no affiliation) replacing the standard 10ga Romex. Also, better to have at least 2 lines, one for analog, and one for digital. He was not using a very high power amp, but a high quality 60 watt pure class A.

I think I will run two different ones to see if I notice any difference in my setup, then go from there.
04-30-15: Jadedavid

NM-B cable (Romex, is trade name of).

Solid core
MC cable.


Link
Pay close attention to pages 31 through 36.
.

Jea48,
Thanks, that's a great article!

I run a dedicated 20 amp line into a Hydra two for my digital gear.Another 20 amp dedicated line directly into a Guardian 2 for my analog gear.No problems just use good quality connector.

The advantage of separating the digital from the analog is worth the extra effort.