I am lucky enough to get a pretty good discount from work on Garmin products. I treated myself to the vivosmart HR. It has a few advantages over other heart rate trackers if you ask me. I love the touch screen ability to scroll through the display screens. The app is pretty well thought out. It has quick reading graphics that highlight your major activities and has additional screens that you can drill down to access more detailed information.
The always on heart rate monitor is a good tool to see how much you are working through the day. I really love the sleep monitor. My dog was sick and got me up 3 times in the middle of the night. I was able to see not only how long I was awake, but also how long it took me to get back to sleep. Longer than I like, but shorter than I thought.