When comparing Convergence vs Batman, the Slant community recommends Convergence for most people. In the question“What are the best custom Android Wear watch faces?” Convergence is ranked 28th while Batman is ranked 55th. The most important reason people chose Convergence is:
This watch face will use less battery by switching to 2 colors when dimmed.
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Pros
Pro Saves battery
This watch face will use less battery by switching to 2 colors when dimmed.
Pro 8 color pallets
Pro Time elements move as you move
Pro Big time and date
This is a functional watch face. At just a moment's glance you can tell what the time and date are.
Pro Cool
It's a Batman watchface which is super cool among a certain crowd. Others may not like it, but it's your watch.
Pro Support both round and square displays
Pro Simple
The design of the watchface is simple so it isn't distracting, but it's interesting enough (if you like BatMan at least) to make you stand out.