The Pebble watches. They may not be made anymore, but they are the only smart watches I have used that felt like an actual smart watch instead of a phone for your wrist. Once mine dies, I may switch to a BangleJS.

Casio need to market their watches better, they have the Smartest dumbwatch**** of them all -

Casio have several lines that support Bluetooth - essentially will beep and vibrate on Notifications, calls and messages. Does basic fitness tracking. It also does all of this whilst basically being indestructible and a battery life of atleast 3 years.

No one seems to know this and I blame Casios poor marketing - I didn’t know any of this until I bought a new G-Shock and realised it had a BT label in the manual.

Casio for sure! Best quality. Made in Japan