Robi01 I purchased this watch in January 2019, the only option at that time was A2836, as far as reliability, the watch keeps good time -3 sec per day, reserve is good at 48 hours. If I were buying it now, I still would choose the A2836 movement. The CHS is only visible at a macro level and the watch isn’t a “perfect clone”. I’m very happy with it. The A3186 , can only speak of what I’ve read on here, and that it’s a delicate movement.