Citizen Eco-Drive OnevsZelos Great White 43

The Citizen Eco-Drive One is widely celebrated for its groundbreaking thinness, with multiple sources confirming its status as the world's thinnest light-powered watch, measuring between 2.98mm and 3.5mm. Owners and reviewers alike praise its exceptional lightness, titanium construction, and good build quality that avoids feeling flimsy, noting its "wow factor" and superb finishing. The watch features a proprietary, ultra-thin Eco-Drive quartz movement and a synthetic sapphire dial, with some models offering up to 12 months of power reserve. However, its high price, ranging from $3,500 to $5,000, is a significant drawback for some, and its aesthetic is considered too plain or dated by a minority who prefer other Citizen models. The Citizen Eco-Drive One is also noted for lacking a seconds hand and having only splash-resistant water protection.

Owners widely praise the Zelos Great White 43's "unbelievable" and "amazing" lume, particularly on the carbon and Frost variants. The Miyota 9015 movement and 300m water resistance are noted features. Some owners find the 43mm size large, while others report it wears well. Opinions are divided on colorways, with some disappointed by the absence of a "Nebula" option and others finding the "Arctic" version striking. Overall, owners rate the Zelos Great White 43 highly for its exceptional lume and robust specifications at the price point.