Is the Apple Watch Ultra 2 any different from Apple Watch Series 9?

On a software standpoint, they both run the same WatchOS 11.

On a hardware standpoint, the Ultra 2 has more capabilities. Including but not limited to better battery life, brighter display, larger screen, deeper diving level, and more.

You can compare the two models here: Apple Watch - Compare Models - Apple

Biggest difference for me is the case. Despite having owned and worn an Apple SE watch for three years I had a SEVERE nickel reaction to the 9 I purchased a year ago. Nickel content made it impossible for me to wear. I replaced the 9 with the titanium Ultra 2 and have worn it almost 24/7 for the past ten months with no issues.

The music over Apple Watch speakers is available on the Series 10. I suspect it is a watchOS change, and not something hardware related.

Otherwise, if the software feature does not depend on specific hardware, then the feature most likely exists on other Apple Watches. But if a feature needs specific hardware, then it is limited to the Apple Watch's that have that hardware.

Apple Watch - Compare Models - Apple

lj2585 wrote:

Thank you - I was trying to determine if (for example), one had more features included in the Fitness App...but if they both run on the same iOS, then it means I have the same functions on the watch I already have.

The Fitness app should share the same features on both Watches. You're welcome and take care.

I upgraded from the Series 5 to the Ultra 2, and also considered to buy the Series 10 instead.

But, besides the far superior battery life, the Ultra 2 is more suited for water activities, longer workouts, can show you the water temperature, can play music over the external speaker, plus has the siren feature.

So I bought the Ultra 2 and I've been enjoying it every day so far.

Agreed. I purchased the Ultra 2 a few months ago and love it ever since, especially the phenomenal battery life.