Image source: Huami

Amazfit Ares vs T-Rex vs GTR: choosing the right outdoor smartwatch

Huami is off to a busy start this year with its Amazfit lineup. At the start of 2020 we saw the unveiling of Bip S. An updated version of the popular Amazfit BIP, it comes with a better heart rate sensor, more sports modes, improved GPS/GLONASS, 5 ATM water-proofing and a higher-spec display.

Essential readingTop fitness trackers and health gadgets

We also saw the T-Rex a few of months ago. It, too, was announced at CES 2020. This one is a totally different animal, though. A watch designed for adventurers it is built to withstand practically anything.

Not one to take it easy, Huami is back now with yet another watch. Just like T-Rex, Ares is built to last. There’s no denying there are lots of similarities between them.

If you’re in the market for an adventurers watch, T-Rex, Ares and Amazfit GTR all present themselves as interesting options. Here’s how they differ.

Amazfit Ares vs T-Rex vs GTR: Design and hardware

Amazfit Ares and T-Rex look nothing alike. But they do share a lot of features.

The first has an octagonal shape and three physical buttons on the right. The watch lacks the Military Certification of T-Rex, but is still able to survive most situations.

The actual dimensions of the main unit are 46.5 x 55.5 x 14mm. Even though it’s fairly large, the device only weighs 48 grams thanks to its polycarbonate build. Additional specs include a 1.28 inch Gorilla Glass protected, reflective colour display with 176 x 176 pixel resolution.

Amazfit Ares vs T-Rex vs GTR: choosing the right outdoor smartwatch
Amazfit Ares | Image source: Huami

T-Rex comes in a more traditional round shape. A 1.3-inch, 360 x 360 resolution AMOLED display sits on top of a high-strength polymer 47.7 x 47.7 x 13.5 mm case. Along the sides are four physical buttons. The watch weights 58 grams, and that’s including the strap.

This is obviously a very rugged device, a competitor to the likes of the Garmin Fenix 6. In fact, it has US Military Standard 810g (MIL-STD-810G) Certification.

Amazfit Ares vs T-Rex vs GTR: choosing the right outdoor smartwatch
Amazfit T-Rex | Image source: Huami

Amazfit GTR has almost the same dimensions as T-Rex but its quite a bit thinner. It is also more premium looking with its Polycarbonate and Zirconia ceramics body, along with stainless steel, aluminium and titanium case options.

Another thing in Amazfit GTR’s favour is its large 1.39 inch Super Retina-grade display. This is definitely the highlight of this device. Probably one of the best quality displays we’ve seen so far on a smartwatch.

Amazfit Ares vs T-Rex vs GTR: choosing the right outdoor smartwatch
Amazfit GTR | Image source: Huami

Common to Ares and T-Rex is the fact there is only one size option. With GTR you get a choice between a 47mm version and a 42mm iteration for smaller wrists (the specs in this article refer to the larger size).

Moving on to water-resistance and on this count all three will suffice. They have an excellent 5 ATM water-resistance rating so you can safely take them swimming with you.

Under the hood the watches share Huami’s latest Biotracker PPG for monitoring heart rate and GPS/GLONASS. The accelerometer on GTR is 6-axis, which is obviously better than 3-axis on the other two. GTR also has an atmospheric pressure sensor and NFC support for UnionPay payments. Ares does not have the Geomagnetic sensor of the other two but it has a barometer.

The incredible battery life is the thing we’ve come to associate with Huami watches. The good news is all of these devices will have you covered. In basic smartwatch mode they will keep ticking along for at least two weeks, T-Rex close to three. Switch on GPS and this will obviously come down drastically.

Here’s an overview of design and hardware differences between Amazfit Ares, T-Rex and GTR (the 47 mm iteration).

Amazfit Ares
Amazfit T-Rex
Amazfit GTR (47mm)
Screen size
1.28 inches LCD
1.3 inches AMOLED
1.39 inches Super Retina-grade AMOLED
Screen resolution
176 x 176p
48 grams
58 grams
up to 40 grams (depending on build material)
Polycarbonate casing
High-strength polymer
Stainless steel, aluminium and titanium case options
Water resistance
US Military Standard 810g (MIL-STD-810G) certification
46.5 x 55.5 x 14mm
47.7 x 47.7 x 13.5 mm
47.2 x 47.2 x 10.75 mm
Battery capacity
200 mAh
390 mAh
410 mAh
Battery life
14 days of battery life with 24-hour heart rate monitoring, 90 days in basic mode
20 days of battery life with regular use, 66 days with basic mode
14 days in normal mode, 46 days in basic watch mode and 25 hours with GPS switched on.
BioTracker PPG biological tracking optical sensor, 3-axis acceleration sensor, barometer, GPS+GLONASS
BioTracker PPG biological tracking optical sensor, 3-axis acceleration sensor, 3-axis geomagnetic sensor, Ambient light sensor, GPS/GLONASS
BioTracker PPG biological tracking optical sensor, 6-axis acceleration sensor, 3-axis geomagnetic sensor, Air-pressure sensor, Capacity sensor, Ambient light sensor, GPS+GLONASS
Bluetooth 4.2
Bluetooth 5.0
Bluetooth 5.0
<$100 (estimate)

Amazfit Ares vs T-Rex vs GTR: Activity tracking and smart features

In terms of actual functionality, there is not much to separate the trio. They all use Huami’s proprietary operating system so the menus, navigation and smartphone app are the same.

All the activity tracking basics are there including heart rate and sleep monitoring. The differences come when it comes to sports tracking.

Amazfit T-Rex
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GTS has 12 sports modes to choose from. Its 6-axis accelerometer means the watch should be slightly better at tracking stats and distance. However, these differences are miniscule.

T-Rex allows users to choose between 14 sports modes. This climbs up to 70 with Ares. Huami’s latest watch is also the only out of the three with Firstbeat metrics. This includes Vo2Max, Training Load, Recovery Time Advisor and Training Effect (Aerobic).

In addition to sharing the upgraded heart rate sensor, the important thing is that both watches have GPS/GLONASS positioning. This should in theory ensure the data is accurate when running or cycling.

You also get the typical smart functionality such as notifications, music control, weather and more. The operating system is simple to use and works well. Amazfit GTS, however, goes a little further with NFC for on-the-go payments.

Amazfit Ares vs T-Rex vs GTR: Bottom line

Most of the differences between these three watches come down to design, the functionality is pretty much the same. If you’re going for style, GTR is the obvious choice. It comes with a stunning high-res AMOLED display, a number of build options and is lightweight and premium looking.

Amazfit GTR review: A stylish fitness watch that won’t break the bank
Amazfit GTR
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T-Rex is the most rugged of the three. In fact it has a US Military Standard 810g (MIL-STD-810G) Certification so can survive most situations. It also comes with the best battery life.

Amazfit Ares has the least impressive design and display quality. But it offers 70 sport modes, some Firstbeat metrics and the most attractive price.

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