Dac or Power regen, which gets the better cable?

The power generator needs a heavy cable, not a "quality" cable.  However, that is very important.

Neither as power cables make no difference in the sound that comes out of hour speakers.

DAC!

I remember being very surprised at the improvement on my BPT power conditioner when I switched from their basic to top of the line power cord...I find the effects of power cords more system dependent than many other cables...

In short run guess I'd pick dac, over the long run all pc important, weak link is weak link. I have heard differences with pc on power conditioners, and yes, they feed everything so need to pass much current.