What type of cables make the most difference

Power cables made the least difference for me and Speaker cables the most!

The cable feeding the transducer - speakers or headphones - makes the most difference ime. Silver (solid) vs copper also makes the most sonic difference here, over exotic geometries and marketing hype.

I have some nice expensive PCs and am pretty sure I can hear their impact on power amps in particular, but at the end of the day I’m also happy to run stock PCs. ICs fall between the PCs and SCs in impact.

It depends... as always, but in general.

Speaker

Amp Power Cord

Interconnects closest to the source

Interconnects further from the source

The rest of the power cords

Then Vibration control speakers.

Vibration control turntable,

then amp, and other components. 

Always had the biggest changes with interconnects. 

All the others makes difference aswell. 

Analog interconnects to/from analog sources.