A man with two clocks never knows what time it [really] is…
I’ve got two heart rate monitors now. One is a Polar H7 chest strap. The other is a Samsung Gear Sport Watch. They are fairly close to each other.
Here is the data from the Polar H7 chest strap as recorded by Strava.
Here is the data from the Samsung Watch as sent from Samsung Health to Strava.
The average is within one and the general trends are close.