When comparing Starwatch vs WeatherPro, the Slant community recommends Starwatch for most people. In the question“What are the best custom Android Wear watch faces?” Starwatch is ranked 5th while WeatherPro is ranked 9th.
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Pros
Pro Based on Star Trek's LCARS interface
Pro Accurate around the world
The accuracy of the prediction is second to none IMO.
Pro Details weather info
Rain probability and estimated quantity by hour, amount of sunshine, temperature felt, etc. Even the radar map for premium subscriptions.
Pro Various alerts
Alerts for thunderstorm, strong heat, strong wind, etc.
Pro Beautiful notification widget
In addition to offering customizable data points, the persistent notification is very colorful and elegant, always standing out from normal notifications.
Cons
Con Not available in the Play Store anymore
The watch was pulled from the store. It still can be found in various forums, but as such there won't be any updates released.
Con Cluttered UI
There's very little finesse present in the layout of the data, everything is just stuffed into unsightly boxes as tightly as possible. This minimizes scrolling but makes it difficult to parse at a glance.