Responses
The main difference is that no matter how little we know, we actually know more about the prince than about Letio. We know the prince is like this in order to survive, as there's prejudice against his demon blood and if he doesn't get the throne he'll end up dead. Before those 3 bullies, the prince allegedly only killed and harmed others mostly out of self-preservation... On the other hand, most of Letio's situation is a still a mystery, thus his motiovations are a lot less clear and less easy to figure out.
I know that the prince is so much different than Letio but i can't point my finger at the exact reason why... Letio just looks more psychopathic but now that I've seen how the prince wanted to kill those 3 too i don't know anymore... please could somebody with more insight enlighten me???