It’s a personal thing, but I just can’t stand wearing a chest strap. I know they are super accurate and you never have to recharge, but I just can’t do it.
I switch between a TICKR FIT and a OH1 interchangably. With arm warmers, I literally forget either is there. Can’t really say I have a preference between the two, some minor pros/cons but both have been super solid for me. I have done a wrist VS forearm VS bicep comparison VS forehead and regardless of device, the location and fit seem to make the biggest diff. I can get fairly accurate wrist HR as long as I wear it high & tight. It is pretty much how nobody wears a watch normally.
What Is Optical Heart Rate Tracking? | Polar Blog has some good info, but has a really good illustration How to get more accurate wrist heart rate readings on your Suunto watch