The reason why I like the Sephora Collection Pro Shadow Brush #15 ($20) best is because of its smaller top (compared to my other eyeshadow brushes this shape). That makes it even easier to precisely apply colour in a specific area (including eyes' inner corners) and to get in close to blur out eyeliner (on both the upper and lower lash lines) for a smoky effect.
This brush works on both powder and cream textures, and even to pack shimmery shades onto my lid without feeling like a bunch is getting trapped in the bristles, or falling elsewhere on my face.