Qin Shi Huang was a greater warrior than Kahless was, Qin Shi Huang formed an empire over a thousand years before Kahless was even born, he defeated four other kingdoms, created a single writing system, legal code and infrastructure. Qin Shi Huang also had hundreds of scholars buried alive can Kahless claim to have accomplished such feats? how many scholars did he have buried? Probably none.
Let's break this down, shall we?
Qin ascended to the throne on 7th may, 247 BC. Kahless ascended to the throne around the year 500 AD. So, your first count is incorrect.
Both emperors created the legal code. Qin likely had Confucian ideals to fall back on, but Kahless created the entire Code of Honor singlehandedly.
Kahless united the entire planet of Qo'noS under his reign, as it remains to this day. Qin did not even unify all of the area in what is for you 21st-century China.
Murdering laborers and scholars is not an honorable thing to do, and yet you boast of it.
In conclusion, Qin sounds more like Molor, the very tyrant Kahless defeated.