TL;DR The author determined the most accurate are the Garmin Epix Pro and the Fitbit Inspire 3
I have a PineTime which I think is pretty good for what it is. In fact, I am very happy with it and recommend wholeheartedly the device.
Still, my favourite is even more basic. I have a standalone pedometer. This one, which has a website tha belies the product's quality. I find it very accurate. It does some basic calorie calculations for you, and distance. And the battery lasts...ages.
Man, I loved my Fitbit One, but damn was it so fickle. So easy to lose and not waterproof, and spotty bluetooth. It was just a basic pedometer with calorie calculations.
FWIW I have an Inspire 3 and it’s reasonable. It has a chime to find it, Bluetooth seems solid enough, and it’s definitely waterproof as I run it under the sink to wash it every day.
Cheap, too, so I don’t really care if it breaks. Small, so not a big, clunky fashion statement or something.
I just wish it tacked my heart rate a little better while I'm working out. Mine loses track what seems like immediately once I start sweating a little. It can recover with a little jostle or sometimes moving the band up a notch if possible, but man it's annoying.
Hmm true. It does sometimes stop tracking, which is extremely annoying.
Another annoyance (that’s probably not unique to it) is that I’m doing calorie counting, and I’ve found I have to halve the calories it reports to get an accurate number.