My absolute requirements for a watch are:
- It should tell the time and date, and update automatically for months which don't have 31 days, and for daylight savings time.
- I should be able to tell the time in a dark room.
- The battery should last at least a couple of weeks before it needs charging.
- It should have a leather strap.
- The design should be unobtrusive.
- It shouldn't be delicate, heavy or stupidly expensive.
Most analogue watches expect me to change the date if the previous month didn't have 31 days. I don't like the design of most digital watches. I have bought quite a few analogue watches with a digital display, but for those the backlight or luminescent display hasn't been great to see the time at night.
I once bought a fancy titanium analogue/digital watch which had been reduced in price a lot, but still cost ~£200. It did most of my requirements, but then I lost it.
I was given a Google Pixel 2 watch for free for a research project. The battery life on that was awful - less than a day. It had some features which would be nice like NFC, so you could use it to store train tickets, but the battery life is far too short for me.
I have been using Xiaomi Mi Bands for 10 years now. A year ago, I bought a
Xiaomi Smart Band 9 Pro. They are now about £50. Then from eBay I spent £5 or £6 for a leather strap, and £3 for a spare USB charging lead.
It has a more watch-like shape than Mi Bands. The display is off most of the time, but switches on automatically if I tilt my wrist to look at it.
I had a heart attack, and its useful to be able to track my heart rate. I have been recommended to exercise with a heart rate between 85 and 105bpm, and the watch is fairly accurate for this (comparing against monitors on gym equipment and manual pulse counting). It tracks my heart rate every so often all of the time. There is a workout mode, which tracks it more frequently. If I am walking briskly to get a train, I like being able to make sure I don't go too fast.
I find the sleep monitoring useful for the odd occaisions when my sleep is interrupted, and I can find out by how much.
I have vibration alerts from my phone for texts and WhatsApp. I can reading some of the message on the screen.
It has a "torch" mode where the screen is turned on full brightness which can be useful
It has a useful "Find my phone" setting which makes the phone beep. The phone app can make the watch beep if I have put the watch down somewhere.
In theory its water resistant to 5 atmospheres, so I could wear it when swimming. I prefer to use a leather strap, and I don't think they like being soaked in water.
It doesn't have a GPS, but I always have my phone with me if I go out, and the watch gets my location from my phone, so that doesn't worry me.
It has simple controls when I'm listening to music or podcasts on my phone (play, pause, next, previous), but I would normally just do that from my ear buds, or the phone.