Sinn U18vsWolbrook Skindiver II Professional

The Sinn U18 is praised for its unique deep blue/green dial with three-dimensional oxygen bubbles that change with light, and its comfortable, easily adjustable bracelet. Owners find the watch stunning and a piece of history, appreciating the refined hands. The Sinn U18 features a 44mm, 15.5mm thick case made from German submarine steel, offering a 2000-meter dive specification and Sinn's Ar-Dehumidifying technology, powered by a Sellita SW300-1 movement. The case thickness is apparent, and the watch comes as a complete set with box and papers for $3,000-$3,680. On balance, owners and reviewers rate the Sinn U18 highly for its striking dial and robust build.

Owners widely praise the Wolbrook Skindiver II Professional for its comfortable wearability, long-lasting lume, and attractive dial designs, with some appreciating the quartz accuracy and smooth sweeping second hand. The watch features a 40mm diameter, a well-weighted 120-click unidirectional countdown bezel with a BGW9 lumed triangle, and a shock-resistant HexapleX case architecture. It is powered by either a Miyota 9015 or 8315 movement, with the latter adjusted in France to ±15 seconds per day and offering a 60-hour power reserve. Some owners find the 20mm strap potentially problematic and note it wears like a 42mm watch despite its 40mm case size. One reviewer expressed disappointment in hand color matching, poor lume, bezel wobble, and the watch sitting high on its strap, ultimately not recommending it.