Indeed, the three brain processors on display at the shop were all quite impressive.
Xu Yang's original brain processor was an in-house product of Kyushu High Pavilion, codenamed "Grand Master." It wouldn't be an exaggeration to call it a top-tier processor; furthermore, as an internal product meant exclusively for company personnel, it was never sold to the public.
In comparison, the Arc of Thought 5th Gen was suitable in function, but was not as powerful; it was 50% less capable than the "Grand Master," which made it rather unsatisfactory to use.
The Nanaco processor, on the other hand, was designed for those peaceful residents of Kyoto Infinity who had no desires or requests. It could uplift spirits but Xu Yang did not wish to lose the ability to perceive pain and sadness. These were all parts of humanity; once forsaken, it would be hard to say one was still a complete human.
