This is too broad. It's like asking "what's the best wrench to tighten nuts and bolts?" For some applications that's a torque wrench, some it's a box end, some it's a socket wrench, some it's a crescent wrench, sometimes it's a pair of vice grips and a hammer. Anything that could properly be called a mode of communication has use cases where it's clearer than others.

The OBD code that's unintelligible to the lay person is the clearest way to communicate a discrete engine problem to a mechanic. A graph that plots a particular change over time might perfectly communicate the raw data, while being incapable of communicating narrative context. A meme image or referential quote might perfectly communicate a specific emotional concept to a broad group that gets the reference, while being totally opaque to those who don't.