Cable advice.
1. Make sure it is proper length.
2. Make sure it is flexible, unless you are into elephant trunks.
3. Shielding is a good idea.
4. Read the marketing. Gobbly gook pufferry, run away.
5. Buy commensurate with the cost of your system.
6. Keep expectations modest.
7. Read forums with large grains of salt.
8. Don't fret with a lack of significant improvement. Just admire your purchase; your friends surely will.
9. Don't post cable threads.