Tudor
build quality is probably comparable to Rolex. For decades, their popular models were more or less identical--shared cases, dials, crystals, crowns, bracelets, etc.--only the movements were different (Rolex used the more premium Aegler movements, Tudor used cheaper Flueriers & ETAs).
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Today, Tudor operates more independently, and with the exception of some previous gen "datejusts" available primarily in the far east, most of their modern offerings/components (including movements, which are now in-house) are distinct from Rolex. Whether (modern) Tudor's build quality is still comparable to Rolex is something I cannot answer definitively. Is it
possible that Tudors now have looser tolerances, poorer fit and finish, etc.? Yes
Is it possible Rolex and Tudor are still equally well put together? Also yes. Unless you've owned a dozen comparable models of each, it's difficult, if not impossible to say for sure. Anecdotally, I think you'll find that most people will take the "Rolex build quality is better" position by default, but this assertion is more often
assumed than
demonstrated using objective standards/criteria. This likely owes, in part, to the hefty premium Rolex Group charges for
Rolex branded watches vs. their Tudor counterparts (Sub vs. BB/Pelagos, Datejust vs. Style, etc.).
With that said, there are some objective differences between the two lines. Rolex's steel
is superior to Tudor's (as others have pointed out), and the glidelock bracelet is arguably the best you will find on a modern sports watch. Movements are more of mixed bag. Rolex's movements are proven workhorses (Tudor's MT series has only been in service for 2-3 years), and they are tested/adjusted to tighter tolerances than Tudor's. However, the 3100 series (still used in most Rolex models, including the subs) is a decades old design, and while Rolex has continued to improve/update it over the years, the in-house Tudor movements tend to
outperform the Rolex 3100s, in my experience. Longevity of the MT series is unknown, obviously, but the the Tudor movements are very, very good performers on the bench and on the wrist. At the high end, it's all Rolex, as Tudor does not have anything in the stable like the 4100 series in the Daytona (but keep an eye on the MT58/B01, which is also looks terrific), or the sublime 9001 in the Sky-Dweller.