If you are talking about chronographs only- Rolex 4130 is the simplest and most serviceable chronograph movement with least number of components in the category. That what I read.
Also I had my AD do the pressure test on my D serial 116520 today and before doing so I asked him to pop up the case back to see the movement. I was delighted to see the blue parachrome hairspring which is supposed to be antimagnetic and shock resistant than any other make ever. Now that makes 4130 best in the category :)
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