Price and Value Proposition
The first and most obvious difference is price. The Apple Watch Ultra 3 retails for approximately €899, while the Amazfit T-Rex Ultra 2 sells for €299. That €600 gap is enormous, and it's a perfectly fair question to ask what exactly you're getting for the extra money. The answer isn't straightforward, because each watch excels in different areas.
The Amazfit offers impressive value for money: military-grade construction, massive battery life, reliable multi-satellite GPS, and basic health metrics. If your priority is long-lasting autonomy on multi-day excursions without worrying about chargers, that alone justifies the entry cost. For casual hikers and outdoor enthusiasts who don't need a full smartwatch, it's hard to beat.
Battery Life: The Biggest Difference
When it comes to battery life, the Amazfit T-Rex Ultra 2 wins by a landslide. Under normal use it delivers up to 20 days of autonomy, while in power-saving mode it can stretch to a full month. With active GPS, it delivers approximately 50 hours of continuous tracking — ideal for multi-day treks or ultra-marathons where charging isn't an option.
The Apple Watch Ultra 3 offers roughly 60 hours of battery under normal use (with the improved Low Power Mode) and 12–15 hours with continuous GPS tracking. While this represents a significant improvement over previous Apple Watch models, it doesn't come close to the Amazfit's levels. For a three-day trekking trip without access to power, the T-Rex Ultra 2 is the clear winner.
Practical Example
On a 5-day hiking trip, the Amazfit T-Rex Ultra 2 will comfortably last the entire trip without charging. The Apple Watch Ultra 3 will need at least one charge — though a small power bank solves the issue. For weekend adventures, both perform well.
Display and Design
Both watches feature AMOLED displays, but quality differs. The Apple Watch Ultra 3 boasts higher brightness (3,000 nits peak), excellent resolution, and a more responsive touch interface. The Amazfit's display is impressive for the price but falls behind in brightness under direct sunlight, which matters during outdoor activities.
In terms of build quality, both meet the MIL-STD-810H military standard for resistance to extreme temperatures, shocks, humidity, and drops. The Apple Watch Ultra 3 uses grade 5 titanium with sapphire crystal glass, while the Amazfit relies on stainless steel with Gorilla Glass. In practice, both hold up exceptionally well under harsh conditions, though the titanium case gives the Apple Watch a slight edge in scratch resistance.
GPS and Navigation
The Apple Watch Ultra 3 features precision dual-frequency GPS (L1 + L5) that delivers outstanding accuracy in challenging environments like deep canyons or dense forest canopy. The Amazfit T-Rex Ultra 2 goes a step further, supporting 6 satellite systems (GPS, GLONASS, Galileo, BDS, QZSS, NavIC) simultaneously in multi-band mode.
In practice, GPS accuracy is excellent on both watches. For the average user, you won't notice a meaningful difference in everyday use. However, in extreme scenarios such as ultra-trail running in mountainous, heavily forested areas, the Amazfit may display a slightly more accurate track line thanks to its wider satellite coverage.
Health Sensors
This is where the Apple Watch Ultra 3 has a clear advantage. It offers an FDA-cleared electrocardiogram (ECG), SpO2 blood oxygen sensor, wrist temperature sensor (useful for ovulation cycle tracking), FDA-cleared VO2 Max estimation, atrial fibrillation (AFib) detection, and high/low heart rate notifications. These are genuine clinical-grade features backed by regulatory approval.
The Amazfit T-Rex Ultra 2 provides heart rate monitoring, SpO2, sleep tracking, and stress tracking via its BioTracker sensor. However, it lacks ECG capability, has no clinical-level clearances, and its measurements are considered indicative rather than medical-grade. If health monitoring is your primary concern, the Apple Watch is in a different league entirely.
Software and Apps
Apple Watch Ultra 3 runs watchOS, the most mature smartwatch operating system on the market. It offers thousands of third-party apps via the App Store, full integration with iPhone, Apple Pay for contactless payments, Siri voice assistant, offline maps via Apple Maps, music streaming from Apple Music, Spotify, and YouTube Music, as well as full notifications with reply capability.
The Amazfit runs Zepp OS, a much lighter operating system. Available apps are limited, NFC payments are not supported in most European countries, and notifications are basic — read-only without the ability to reply. If you use the watch solely for sports tracking and basic notifications, this isn't a problem. If you want a complete smartwatch experience, it may feel restrictive.
Ecosystem
The Apple Watch Ultra 3 is part of the broader Apple ecosystem. This means seamless connection with iPhone, iPad, Mac, AirPods, and HomeKit. You can unlock your Mac from your wrist, control smart home lights, make FaceTime audio calls, and use the watch as a remote iPhone camera shutter.
The Amazfit T-Rex Ultra 2 operates more independently. It connects via Bluetooth to both iPhone and Android, but doesn't offer deep integration with any ecosystem. This can actually be an advantage — you're not locked into one platform, and switching phones is effortless.
Best for Outdoor Adventures
If you're looking for a watch exclusively for hiking, mountaineering, and ultra trails, the Amazfit T-Rex Ultra 2 offers remarkable value at €299. If you want a watch that does everything — health monitoring, apps, payments, ecosystem integration — then the Apple Watch Ultra 3 justifies its €899 price tag.
Which Should You Buy?
The decision comes down to your priorities. If battery life and price are your primary criteria, the Amazfit T-Rex Ultra 2 is an excellent choice that will handle serious outdoor adventures without breaking the bank. If you demand the best health sensors, top-tier software, and full iPhone integration, the Apple Watch Ultra 3 remains unmatched in its category.
For Android users, the choice is even simpler: the Apple Watch doesn't work at all without an iPhone, making the Amazfit the only option here. For the average iPhone user who wants a rugged adventure watch without spending nearly a thousand euros, the T-Rex Ultra 2 is an incredibly attractive proposition that delivers far more than its price suggests.
Frequently Asked Questions
Does the Amazfit T-Rex Ultra 2 work with iPhone?
Yes, it works with both iPhone and Android via the Zepp app. The connection is made through Bluetooth and doesn't require a specific phone. However, the experience isn't as deeply integrated as Apple Watch with iPhone.
Which has better GPS?
Both have excellent GPS. The Amazfit supports 6 satellite systems simultaneously, while Apple uses dual-frequency L1+L5. In most conditions, the accuracy is practically identical. In extreme environments, the Amazfit may have a slight edge due to wider satellite coverage.
Can I swim with both?
Yes. Both watches are water-resistant and suitable for swimming. The Apple Watch Ultra 3 supports diving to 40 metres with a built-in depth gauge, while the Amazfit is rated to 100 metres but without dedicated dive features.
Is the Apple Watch worth three times the price?
It depends on usage. If you want a full smartwatch with medical-grade sensors, a rich app ecosystem, and Apple integration, yes. If you want a reliable GPS sports watch for outdoor excursions, the Amazfit's €299 price point covers your needs comprehensively.
Which has better build quality?
The Apple Watch Ultra 3 uses titanium and sapphire crystal, considered superior materials. The Amazfit uses stainless steel with Gorilla Glass. Both are MIL-STD-810H certified. In daily use, durability is practically the same — both can handle bumps, scratches, and extreme conditions without issue.
