When comparing Pebble Time Round vs LG G Watch R, the Slant community recommends LG G Watch R for most people. In the question“What is the best round smartwatch?” LG G Watch R is ranked 4th while Pebble Time Round is ranked 6th.
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Pros
Pro 2 day battery life
Despite it's very thin body, it gets 2-2.5 days of actual use. If you usually have the brightness maxed out however, that could dip down to just a day and a half. Either way, it will last for at least a full day as well as a night (if you wear your watch to bed).
The watch also charges very quickly - 15 minutes will yield about 60% of a charge, and it will be fully charged in 30 minutes. In addition, SnartStraps are expected sometime in 2016. This is a larger strap that includes an extra battery, allowing your Pebble Time Round to last up to a full week between charges.
Pro Small and lightweight
While most smartwatches are very bulky and not super comfortable to wear, the Pebble Time Round is only 7.5mm thick and weighs 28g. Compare this with the 10.5mm and 50g Apple Watch or 9.7mm and 62g LG G Watch R, and you'll see that it's really thin and light for a smartwatch.
Pro Simple to use
On one side is a power button, and on the other side is a select button surrounded by up and down buttons. The Timeline UI is simple - press up to get to previous notifications, and down to scroll through upcoming calendar events or future events.
All navigation is done through the buttons, as there is no touch screen.
Pro Battery efficient display
To save battery, Pebble went with an e-paper display. This means that the screen will only draw power when its refreshing the image, saving battery life. The e-paper display is the main reason how Pebble could make the watch so thin and light.
Pro Can be customized with any 22mm watch strap
Pro Appears to be a traditional watch
The LG G Watch R is not nearly as attention seeking as other smartwatches.
Pro Great specs for fast speeds
The G Watch R has 4GB of internal storage, a 1.2GHz processor, and 512MB of RAM.
Pro Glare resistant high quality 320x320 resolution
The G Watch R has a sharper resolution than the previous version, and is meant to promote visibility in direct sunlight.
Pro Water and dust resistant
It's IP67 certified.
Pro Completely round display
Many users seem to hate square watches because they look antiquated and clunky. The G Watch R is refreshing to many folks because of its attractive round face.
Pro PPG heart-rate sensor
Pro Waterproof to one meter for 30 minutes
This watch will do fine in the rain, shower, or while washing hands - but it shouldn't be submerged in water frequently.
Cons
Con No longer supported
Pebble was purchased by Fitbit and has ceased operations as well as selling. You can view more information about it here.
Con e-paper display
The display may be energy efficient, but it is low resolution (180x180) and pretty small at just 1". It's also hard to read outdoors because of how dim it is, and colors aren't as punchy as on OLED or IPS displays.
Con Huge bezels
The bezels are very large, even for a smartwatch (especially when compared next to a Huawei Watch or Moto 360). Some versions have numbers printed on the bezel which at least makes use of it, but then that also limits the watch faces you can use.
Con Limited app compatibility
The Pebble Time Round isn't compatible with all of Pebble's older apps which were designed for square watch faces. Also, because it's a propriety OS, it won't see the same level of developer support as Android Wear or Apple Watch OS.
Con Discontinued
The LG G Watch R has been discontinued in favor of the new LG Watch Urbane. It is no longer available from the Google Play Store, and the only Amazon listings are over $600.
Con Expensive
The watch is expected to cost around $290 - it could be argued that the watch is overpriced for the amount of benefit it produces.
Con Low app compatibility because of the circular screen
Many apps are made to accommodate square screens, so the G Watch R's circular screen may result in frequent compatibility issues.
Con Inconsistent voice command accuracy
This watch is highly accurate for short commands like setting a timer or asking for directions, but longer commands are often misinterpreted.
Con Two day battery life
While the battery in this watch is much better than some of the alternatives, it still has a long way to go in order to become a competitor with the top smart-watches in terms of battery life.