HDMI 2.1 is a solid all-rounder with support for 4K at 120Hz, or 8K at 60Hz. HDMI 2.0b is a solid choice for 4K 60Hz, too, ...
For making ARC connections, a high-speed HDMI cable is recommended. For eARC, both a standard HDMI Cable with Ethernet and a high-speed HDMI Cable with Ethernet will work, according to HDMI Licensing.