The Apple Watch Ultra 3 has a 1.98″ OLED/AMOLED display, which is larger than the Garmin Venu 4's 1.4″ OLED/AMOLED screen. Both displays are capable of always-on functionality. In terms of resolution, the Apple Watch Ultra 3 offers 422 x 514 px, while the Garmin Venu 4 provides a slightly higher resolution of 454 x 454 px. The pixel density on the Garmin Venu 4 is also higher at 458 ppi, compared to the Apple Watch Ultra 3's 326 ppi. Both watches feature touchscreens, but only the Apple Watch Ultra 3 has sapphire glass for added protection, while the Garmin Venu 4 lacks this feature.
When it comes to water resistance, the Apple Watch Ultra 3 is rated for 10 ATM (100 meters), offering superior depth resistance compared to the Garmin Venu 4, which has a 5 ATM (50 meters) rating. Both products are waterproof, but the Apple Watch Ultra 3 is designed to handle more extreme conditions. Both watches have replaceable bands, but only the Garmin Venu 4 includes branded damage-resistant glass.
The two devices are quite similar in thickness, both measuring 12 mm. However, the Apple Watch Ultra 3 is slightly heavier at 61.8 g, compared to the Garmin Venu 4's 38 g. In terms of dimensions, the Apple Watch Ultra 3 is larger with a height of 49 mm and a width of 44 mm, while the Garmin Venu 4 is more compact, with a height of 45 mm and a width of 45 mm. Both watches can operate in temperatures as low as -20 °C and as high as 55 °C, so they are similarly durable in terms of temperature extremes. Finally, the Apple Watch Ultra 3 has a larger volume at 25.872 cm³, compared to the Garmin Venu 4's 24.3 cm³.