Garmin has some of the worst and buggy software out there, they are slow with fixing issues IF at all, i got bike computers from them and they are frustrating at time, crashing, buggy etc. Just look at their official forums its dreadful.
Can`t speak for their smartwatches, but at this price point i feel both the AW Ultra and Garmin watches are overpriced.
But that being said for running and considering the battery life and your needs the Garmin is the clear winner.
I ordered a AW Ultra because i use my bike computer to record my cycling, the AW is more of my daily health coach, making sure i close my rings, monitor my sleep and most importantly is standalone via cellular as i hate being connected to the internet/social media.
A dumbphone would have worked as well and way cheaper but the weaksause me likes futuristic gadgets especially wristwatch ones i blame my childhood cartoons for that.