hdmi cable 2.1

So I have bought myself a new 4k 144hz monitor which also supports gsync etc. So I have been thinking what would be the best way to enjoy this display. It has 2 HDMI 2.1 ports and 1 DP 1.4. DP 1.4 supports 4k 144hz but it does so with DSC (display stream compression) which I have heard is...

All cables are box packed never opened. These are excellent flat hdmi cables that support 4k, 3D, arc, HDR, Atmos etc. All have 90 deg elbow adapter. Super flat cable ideal for under doors or carpets or through windows and narrow spaces. Gold plated connectors. I am using some of these myself...

I am looking for getting either 3 feet, 6 feet or 10 feet DP and HDMI cables for my system. which one should I get ? my personal system will use 3 or 6 feet cable and my other system which I plan on doing multi seat will use the 6 or 10 feet cable :)