The Aeron's mesh seat and back provide excellent ventilation, which is crucial if you tend to get warm while sitting. The Titan Evo, while comfortable, can get a bit warm after extended use. The Aeron also has more adjustability, allowing for a more customized fit. However, the Titan Evo's built-in lumbar support is quite effective, and many users find it sufficient. If your budget is a major concern, the Titan Evo is a solid option, but if you prioritize breathability and maximum adjustability, the Aeron is likely the better choice, especially given your height and weight.