I was extremely sensitive to the PWM of the OLED display on the iPhone X. Haven’t had any issues with past generations of the Apple Watch (the PWM implementation on Apple Watch seems better than on iPhone) so I was looking to upgrade to a Series 4 and came across this thread.
Have you guys experienced sensitivity to past generations of the Apple Watch?
[doublepost=1548493523][/doublepost]A Google search turned up a promising result that the newer LTPO OLED display on the Apple Watch Series 4 doesn’t use PWM, though I’m not sure of the accuracy as nobody has formally tested it. I’ll head to a store tomorrow to check since the larger display could be fantastic for when I want to be less reliant on my iPhone, especially since they’ve added a Podcasts app.
https://www.valuewalk.com/2018/10/apple-watch-series-4-light-bleed-issue/
I haven't had any older apple watches but I can tell you for sure that the S4 is using PWM. It can easily be seen in slow motion video.