When comparing WeatherPro vs Planets, the Slant community recommends Planets for most people. In the question“What are the best custom Android Wear watch faces?” Planets is ranked 1st while WeatherPro is ranked 9th.
Ranked in these QuestionsQuestion Ranking
Pros
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.
Pro Two themes to choose from
Pro Displays the actual current positions of the planets
The watchface collects NASA data and uses it to put planets in their appropriate places.
Cons
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.

Con Initial spin makes it hard tell time with a quick glance
Each time checking the watch all the planets spin wildly before settling into position. It can be distracting and arguably unnecessary.
Con Eats up battery life
Eats the battery at about 3 times the rate of the standard watch face.
