The sleeved cables look nice. Are you able to see any of the cable through the sleeving?
You can't see anything, on closer look on white cables you only see nice shine white, black connectors and nothing else.
Material is much better than on extensions where you can stretch and move sleeve over wire and than look ugly if you see wires under.
No matter on wire color under.
This is best option, I have 30m of MDPC-X sleeve, MDPC-X Tool for pin remover, but I will use this cables, because they are durable, thinner and give more natural look. If someone upgrade on other components he can sell own blue cables example for little cheaper price and with next build choose some other color. Grey color would be great but I'm not sure how many people are interest for that.