If your devices only support up to 4K at 60Hz, a "premium high-speed" HDMI cable (18Gbps, HDMI 2.0) is perfectly fine. Again, just avoid really old or thin cables. Early HDMI cables (HDMI 1.4 or older ...
To keep Apple TV 4K’s interface true to SDR, it’s best to pick a video format that avoids unwanted HDR processing. For that, ...