I am a biased garmin fan boy, so take my word with a grain of salt.

Garmin is great in terms of providing fitness watches. The ekg feature is new to the Venu 2, but they have always had devices that have supported basic heart rate monitoring.

My Forerunner 10 that I got back in 2012 had a heart rate function. My current garmin Forerunner 35 also does heart rate monitoring, which came out before the first apple watch.

My parents both have Garmin Forerunners, a 255 and a 745. They both have wearable heart rate monitors that are separate and strap to the chest, which is more accurate than the radial reads you get from a watch.

My wife has the Garmin Venu 2. We just got it but haven't messed around with the functionality too much yet.

The Garmin app is also my favorite app for tracking my running and overall fitness.