I can only test this on cycling. I have had several garmin bike computers including watches and my bike has a built in computer that also has a power meter so it knows how much effort I am putting out. they both have heart rate and cadence to. my bike computer most likley is the most accurate since it knows how much effort I am putting out and my heart rate. usually my commute to work is around 220 calories burned. the garmins tend to be about 50 calories more. ( I wish I could connect it to a power meter to see how well it matched) but I tested the watch so I could get more heart rate info into the heath app. well apple gives me over 400 calories burned its a huge difference between the two.
I wish I could test it on walking but I seldom walk anywhere now we ride everywhere.
I wish I could test it on walking but I seldom walk anywhere now we ride everywhere.