Perspective: it’s the way that we all see the world, so it makes sense to draw in perspective when depicting real-world objects. Take for example this elegant diagram of a London subway station, drawn by Italian architect & engineer Renzo Picasso. He chose a perspective view that enables us to see the entire station and immediately understand its scale and connections.
Now for comparison, have a look at two axonometric views of the same station:
Parallel projection drawings (including plan, elevation, section, and axonometric views) are useful for documentation because they are relatively easy to create and have a consistent scale that can be measured. However, when it comes to sharing the big picture, a perspective drawing is the way to go.