Resolution and Refresh Rate: Look for splitters that support the resolution and refresh rate of your devices (e.g., 4K at 60Hz, 1080p).
HDMI Version: Consider HDMI 2.0 or later for full 4K support and higher bandwidth.
Audio Support: Check for support for various audio formats like Dolby TrueHD, DTS-HD, and 7.1 surround sound.