Polar - Grit X Pro

The first thing I used was a Garmin Vivosmart 4. It was a thing fitness band, so turning it inside on my wrist wasn't too uncomfortable. Then I got a Polar H10 chest strap. First tracking using my phone in the Polar Beat app. I think this is the only option if you want to use the "save on device" feature. Which is useful if you're going to be doing something like martial arts training. Now I use my Polar H10 paired to my watch (Polar GritX Pro). I think this is the best of the options I've used. I put the watch beside me on the ground and still use the buttons to count sets (I'm surprisingly bad at this when my heart rate gets high).

I am not an apple person but the Apple watch is routinely the best one on the market from independent studies and scientific studies. Personally I use a Polar GritX that's a couple years old.

When I was swimming regularly in a 25m pool with grit x and vantage V, I found that taking a little longer from pushing off from the side before taking the first stroke on each turn makes a huge difference to accuracy of recordings. Only issues I’d ever have were the occasional missed turn.

Polar Grit X. Polar is like Garmin but much cheaper.

Don't get a Polar. My Grit X lap tracking is all whack with no way to fix the data, and the strokes misinterpreted all the time. Maybe it's just my shitty form.