The Brush tool and the Pencil tool differ in their stroke characteristics and intended use.

The Brush tool provides an organic, freehand feel, simulating painting on a canvas and offering variable thickness and textures. It is suitable for digital painting, artistic effects, and fluid illustrations. On the other hand, the Pencil tool produces precise, hard-edged lines with a consistent thickness, similar to drawing with a physical pencil on paper. It is ideal for technical drawings, clean outlines, and situations requiring accuracy and control.

The Brush tool is preferred for expressive and artistic work, while the Pencil tool excels in creating exact and defined lines.