Apple Watch Ultra 2 vs Series 9: Which Is Better in This Scientific Review?

TL;DR

The Apple Watch Series 9 is sufficient for most users, while the Ultra 2 mainly makes sense for people who want longer battery life and rugged outdoor features. Testing covered 42 workouts, five nights of sleep data, 18 bike rides, and more than 100 oxygen-saturation data points; the Ultra 2 did not consistently outperform the Series 9 in heart-rate or GPS accuracy. Read on to compare the evidence behind each buying choice.

Transcript

I didn't think I'd say this but you might want to think twice before getting the Apple watch Ultra 2 or maybe a better wording is that I'm personally conflicted about this watch I've collected a lot of data with the Apple watch Ultra 2 over the last 10 days and what bothers me is that it doesn't seem to be any better and might even be worse in some... Read More

Key Insights

• The Apple Watch Ultra 2 features a brighter screen with 3,000 nits compared to the Ultra 1's 2,000 nits.
• The Ultra 2 includes a new S9 chip enabling the double tap feature for control.
• Battery life is extended in the Ultra 2, lasting up to 36 hours versus the Series 9's 18 hours.
• Heart rate tracking on the Ultra 2 is slightly less accurate than the Series 9, especially during outdoor cycling.
• GPS tracking on the Ultra 2 shows some inconsistencies, sometimes performing worse than the Series 9.
• Sleep stage tracking on the Ultra 2 is highly accurate, matching the performance of the Series 9.
• Oxygen saturation readings on the Ultra 2 are generally within normal ranges but require further testing.
• The Ultra 2 is better suited for users needing a rugged watch for extreme outdoor activities.

Questions & Answers

Q: Is the Apple Watch Ultra 2 better than the Series 9?

Not consistently. The Ultra 2 offers up to 36 hours of battery life and outdoor-focused features, but testing found no significant advantage over the Series 9 in heart-rate tracking or GPS accuracy; for most users, the Series 9 is sufficient.

Q: How was the Apple Watch Ultra 2 scientifically tested?

Rob, a postdoctoral scientist specializing in biological data analysis, collected Ultra 2 data over 10 days. Testing included 42 workouts, five nights of sleep data, 18 bike rides for GPS consistency, and more than 100 oxygen-saturation data points.

Q: How does Ultra 2 battery life compare with Series 9?

The Ultra 2 provides up to 36 hours of battery life, compared with up to 18 hours for the Series 9. Both support fast charging, and the Ultra 2 takes about one hour to reach 80% charge.

Q: Is Ultra 2 heart-rate tracking more accurate than Series 9?

No; the Ultra 2 was slightly less accurate than the Series 9, particularly during outdoor cycling. Its heart-rate performance was evaluated across seven indoor cycling sessions, 21 outdoor bike rides, seven weightlifting sessions, and seven outdoor runs.

Q: Does Ultra 2 GPS outperform Series 9 GPS?

Not consistently, despite the Ultra 2 having precision dual-frequency GPS. Results from 18 bike rides showed inconsistencies, with the Ultra 2 sometimes performing worse than the Series 9.

Q: How accurate is sleep-stage tracking on the Apple Watch Ultra 2?

The Ultra 2 delivered highly accurate sleep-stage tracking across five nights of collected data. Its performance was comparable to the Series 9.

Q: What improvements does Apple Watch Ultra 2 have over Ultra 1?

The Ultra 2 raises maximum screen brightness from 2,000 nits to 3,000 nits and adds the S9 chip, which enables double tap. It also includes Apple's second-generation Ultra Wideband chip for precisely locating a lost iPhone and supports some on-device Siri processing.

Q: Who should buy the Apple Watch Ultra 2 instead of Series 9?

The Ultra 2 is best suited to people who value its longer battery life, larger screen, rugged construction, and features geared toward activities such as hiking, diving, and marathons. For most users who do not need those outdoor-focused benefits, the Series 9 provides sufficient capabilities.

Summary & Key Takeaways

• The Apple Watch Ultra 2 introduces enhancements like a brighter display and longer battery life, but its performance in heart rate tracking and GPS accuracy may not surpass the Series 9. For users focused on extreme outdoor activities, the Ultra 2 offers rugged features, but the Series 9 is sufficient for most needs.

• Heart rate tracking on the Ultra 2 is slightly less accurate than the Series 9, particularly during outdoor activities. GPS tracking shows some inconsistencies, sometimes performing worse than the Series 9, despite the Ultra 2's dual frequency GPS feature.

• Sleep stage tracking on the Ultra 2 is highly accurate, comparable to the Series 9. Oxygen saturation readings require further testing, but generally fall within normal ranges. The Ultra 2 appeals to those needing a rugged watch for outdoor activities, while the Series 9 is suitable for most users.