When running, playing football, commuting on the bike or on a 200km Audax: Garmin Forerunner 405.
Only 8 hours battery life when running as a GPS but it can survive a 200km Audax with a recharge blast from a usb-battery-pack thingy at the lunch stop. Waterproof but the bezel controls go mental when it gets wet, rather annoying.
On longer Audaxes I wear a basic Polar HRM watch.
Tells me my HR (not that I ever change how I ride based on my HR), the time (as does my phone, GPS and cycle computer, so not really necessary) and works in the dark (again, so does the GPS and when it's dark I don't really care what time it is). Very waterproof, thankfully.
When not on the bike or doing some exercise I've got a Mondaine Swiss railway watch.
But not always, I often find I've left the house without a watch on and don't really care either way. Just not interested in dress watches (expensive or not).