Apple Watch Series 9 vs. Series 12 Buyer's Guide: Is It Worth Upgrading?

Apple has launched the Apple Watch Series 12, three years after introducing the Series 9. The newer model boasts a thinner design, larger displays, faster charging, new health sensors, and better overall performance. The decision to upgrade from a Series 9 largely depends on the additional hardware and features you'll gain.

Key differences between the Series 9 and Series 12 include various case sizes, materials, and colors, as well as display sizes and types. The Series 12 features a thinner, more modern design with a larger display area compared to its predecessor. It also uses advanced materials like ceramic and sapphire crystal, and offers improved sensors for heart rate, HRV, and recovery tracking.

In terms of health monitoring, the Series 12 provides more frequent heart rate and HRV readings, along with new features like wrist and water temperature sensors, depth gauge, and microphone for Audio Intelligence. While the Series 9 still offers essential health features like an always-on display, ECG, and sleep apnea notifications, the Series 12's advanced sensors and health metrics may be more appealing for those who use their watch for training, recovery, and swimming.

Battery life is another consideration, with the Series 12 offering up to 80% charge in about 45 minutes and up to 38 hours in Low Power Mode. However, the difference may not be significant enough to justify an upgrade alone. The Series 12 also has a slightly larger battery and charges faster, but this may not be enough to sway potential buyers.

For new purchases, the Series 12 is the recommended choice, as it offers a more upgraded experience at the same $399 starting price as the Series 9 when it was new. The older model may only be worth considering as a discounted alternative if you're satisfied with its current health features. However, buyers should carefully inspect the battery health, physical condition, and warranty before purchasing a used or refurbished Series 9.