When you notice your Garmin is under 10% it still means full day or enough battery to track 2-3h activity and still have some battery left. I'm surprised Apple watch battery is still - more or less the worst in the industry. Even if we forget about Garmin, comparable Samsung watches are multiday devices.
Garmin is great, but it is a fitness sports watch first and less of a smart watch. Once Garmin can have apps like overcast and omnifocus on them I will think of them as being in the some category as the apple watch.
Garmin has apps like Overcast. There are multiple music services built in like Spotify and YouTube that support podcasts. And there are additional third-party podcast apps on the Connect IQ store.