Citizen Eco-Drive OnevsFears Arnos (Blue)

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.

The Fears Arnos (Blue) is lauded for its striking blue galvanic dial with a hobnail surround and Roman numerals, housed in a vintage-inspired 33.5mm rectangular stainless steel case measuring 8.4mm in thickness. Reviewers note the convenience of its automatic Sellita SW1000-1b movement, which offers a 46-hour power reserve. On balance, reviewers praise the Fears Arnos (Blue) for its distinctive dial and slim, wearable case.