I'd second Garmin. To me the killer features of my Pebble were the lack of a touchscreen, the long battery life from the passively lit display, and the ability for developers to write their own software - all qualities that the Garmin line possesses.

The only downside of the Garmin devices is the extra fitness sensors (gps, hrm, pulseox) which not all Pebble users might want. As a runner and cyclist myself these features are all upside, but not everybody will use them and they add to cost / size.

I can recommend the forerunner series. I have the 945 which is marketed at runners but it has the same features as their other high end devices, just in a smaller and lighter plastic case.

I replaced my Pebble 2 when it broke with a Garmin Vivoactive 3 and it is surprisingly good with almost as long battery life.

I need it mainly for blood glucose monitoring and I keep the watchface on all the time that does this.

The downside is that there is no way to stop Garmin to automatically updating the watch software and once an update broke the http callbacks causing my watchface to stop functioning. Angry comments pushed them to stop the automatic updates until the bugs were fixed and let me to downgrade the OS.

Seconded. Those devices are unexpectedly good.