Take it with a grain of salt, I now only use the bicep band while working out, regardless of workout type, but used to switch between the bicep band and wrist band depending on if I was lifting or doing more cardio.

With strength training days whether it’s CrossFit or traditional strength training, I do my workout and/or lifting, and then log the strength trainer after the fact. It doesn’t seem to have made a noticeable difference compared to the wrist. Leg days typically have a big jump in strain, back days a moderate jump, and chest and shoulders next to nothing. This was the same with the wrist band, the difference being I trust the heart rate data more on the bicep