The Crown Brush Studio Series C138 Round Contour brush (Coastal Scents Sable Contour Brush) and the Crown Brush C317 Deluxe Crease brush both do a great job at contouring, defining the outer v, and adding color to the outer corner or inner tear duct. However, the bristles of the C138 is a little bit denser and softer than the C317. The handle of the C317 (7.5 inches) is also much longer compared to the C138 (5.5 inches).
The C317 costs $2.49 at CrownBrush.com, while the C138 is $1.87. You can also buy the C138 from Coastal Scents for $1.79.
How do they compare to the S217 and C222 (review)? The bristles of the C138 and C317 are a little bit shorter and less fuller. It's easier to blend out the outer corner color with either my S217 or C222 because the bristles are denser.
If I could only keep one brush, I would choose the S217 because the bristles are fuller and the handle is the perfect size.