> all-day 18-hour battery life. Is there a standard for what "all-day" means? I think most would initially assume 24 hours, but thinking about it more, it seems reasonable to consider "can work from wake up to sleep" or "can work from sunup to sundown"/
Unlike the Samsung Watch which will do several days with always on display, GPS enabled. But congratulations to Apple for finally making their watches usable as, well, a watch.
Call me old fashioned if you must. I disabled gesture based display on (with night mode turning it off when asleep) as the first thing when I got the S3 Frontier, then sold it / upgraded to Watch later for improved battery life. It does at least 50% better and is faster as well.
Garmin watches also do well for displaying time, even better in fact, but they are a fair bit more expensive.