I prefer the Sinn. I may be misremembering but I think when Breitling went bust during the quartz crisis, Sinn bought the rights to the Navitimer design and Ollech and Wajs bought the last of the Breitling stock. The O&Ws became the Aviation and Sinn started making the 903. I think therefore the Sinn is closest to the original design.
All this could be nonsense maybe someone will appear and correct me
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