POWER CABLE FEATURES

Hi, for many years in this hobby I have paid the least attention to power wires ... I just used quality "computer" cords and that was enough.
Yes, I brought home expensive wires and compared them - there was a difference, but not so much to pay so much money for a piece of wire.

Now I decided to replace the cables (catching fleas - fine tuning the system), chose the manufacturer ...

So my question is - two cables of the same design, but different sections (1.5 and 2.5 squares) ...

How does the thickness of the cable most often affect the sound?

my consumers: CD transport (40 watts), DAC (50 watts), tube amplifier (consumes 130 watts).

Of course, it is better to compare and find out, but like everyone else, there is no such possibility ... Therefore, I am looking for those who have identified a common pattern (from personal experience).

Any caliber of these two will work for my system, but suddenly there is a feature that can be used ...

what I want ? - correct balance, more black background, image depth ...