Even with everything so dependent upon the definition of "best," I've always found this TZ article on the C.O.S.C. to be particularly praising of Rolex and their movements:
http://people.timezone.com/library/w...33384647656250
Quote:
The World’s Most Accurate and Precise Movement Revealed
Now, among all the assorted WISes, watch enthusiasts and experts that frequent TimeZone to tell the world what watches they wear, it is extremely unlikely that any owns a watch with the world’s best performing movement. It is equally unlikely that the woman who owns a Rolex automatic Oyster Datejust is aware that the caliber 2235 automatic inside is the most consistently precise and accurate movement tested by COSC.
Even more amazingly, at less than 20mm, the Rolex 2235 falls into the smallest category where the tolerances are at their widest, yet performs well within the tightest allowances reserved for pocket-watches. Almost 200,000 of these movements passed the COSC test in 2001. Does Rolex have a secret? "It’s their immense know-how in construction and manufacturing," says Mr Curchod (former dean of the Geneva Watchmaking School, president of the Swiss Society of Chronometry and director of the Geneva laboratory of COSC) reverently.
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I used to bust this article out all the time on people who'd spout nonsense about how they "heard Rolexes keep bad time," etc.