When comparing Chron vs S7en, the Slant community recommends S7en for most people. In the question“What are the best custom Android Wear watch faces?” S7en is ranked 4th while Chron is ranked 8th. The most important reason people chose S7en is:
S7en is available in purple, green, black, white, and blue.
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Pros
Pro Detailed cyberpunk aesthetic
A Tron-like watchface with neon blues and yellows.
Pro Dimmed mode
Pro Circular display ready
The developers have confirmed that the watchface is ready for circular displays and promises to adjust it for Moto 360 as needed when they get their hands on the device.
Pro Shows date
Pro Has 5 color variations to choose from
S7en is available in purple, green, black, white, and blue.
Pro Customizable
Editable with every image editor.
Cons
Con Not compatible with LG G Watch W100
Connection to the phone gets lost while using this watch face on LG G Watch W100.
Con Some setup is requried
Requires installing Wear Faces app, extracting the zip archive in smartphone's pictures folder and selecting the pictures in the app.