What is the best automatic movement

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Notwithstanding the OP's Omega restriction, don't you think that the JLC 920 is a masterpiece (if an expensive one to manufacture)? Ruby rollers...😀
... and it was used by PP, AP and VC (and justifiably so, IMO).

You could be right, I was thinking more about vintage movements, since that was the context.
 
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I am looking for recommended movements to study, then try and find a good one. Google searching can only take you so far, so am looking for advise from the forum. The plan is to try and find another really cool Vintage Seamaster with a different automatic movement. I have a vintage Heuer with a Valjoux 23 movement but its not accurate as a time keeper. the Omega 562 on the other hand is superb.

Have you considered looking into the bumper movements? They are well-built and it is a novel experience to wear one for the first time.