With the newer Apple Watches you can just use fast charging. I basically just charge it when I shower and do my night time hygiene routine and it’s ready to go back on my wrist to track my sleep and act as a silent vibration alarm in the morning so that I don’t wake my wife up early. The only time I run into battery life issues is when I go on a weekend camping trip.
Likewise–I pop it on the charger in the shower and occasionally at work if I'm at my desk. The alarms, timers, and reminders access (via Siri) more than makes up for the inconvenience of frequent charging. Notifications for messages and e-mails is just a bonus that sometimes ends up being a double-edged sword. The only downsides for me come on long bike rides, and that it is ugly (and getting too big, coming from a Casio F91-W).
I’ve owned both and the truth is Garmin makes the best fitness tracker that can be a smartwatch and Apple makes the best smartwatch that can be a fitness tracker.