High-bitrate 1080p files avoid the "blocky" look often seen in heavily compressed social media uploads.

High-quality 60fps masters age better on modern high-refresh-rate displays. Hardware Requirements for Premium Playback

Ensure you are using a monitor or screen with at least a 60Hz refresh rate. If your hardware is locked at 30Hz, the benefits of a 60fps file will be lost, as the screen cannot physically update fast enough to show the extra frames. Connection Speed