The Oline ErgoPro Ergonomic Office Chair is ideal for users up to 300 lbs seeking comprehensive ergonomic features without breaking the bank. If you prioritize 4D adjustable armrests, an adjustable headrest, and 3D lumbar support, along with a reliable 90-135 degree recline with tilt lock, this chair is a strong contender. It's also perfect for those who value floor-safe, silent blade wheels and don't require seat depth adjustment or forward tilt, offering robust adjustability for core needs at an attractive price point.

The ProtoArc Ergonomic Office Chair – EC200 is best suited for individuals up to 350 lbs, especially 'big & tall' users who require superior support and adjustability. If a 12-year warranty offers crucial peace of mind and you need the critical sliding seat depth adjustment for optimal leg and back support during 8+ hour workdays, this chair is for you. Those willing to invest slightly more for enhanced longevity, higher weight capacity, and a precise ergonomic fit will find the EC200 a worthwhile upgrade despite a potential learning curve for adjustments.