First, to give experience context, in regards to wearable trackers with HR, I've owned and used for tracking activities:
Gear Fit 2
Gear S2
Gear S3
Fitbit Blaze
Garmin 735XT
Garmin Vivoactive HR
Moto 360 Sport
Polar M600
Apple Watch (both orig and series 2)
MotoACTV
Ticwatch 2
LG Urbane 2nd...