Khan is basically just a rip-off of Azog from the hobbit. they were even killed exactly the same way and shared the title of leader of the orcs. they both had white skin and share similar nicknames. Azog is known as 'the pale orc' and Khan is 'the albino orc'.
But I'm gonna say Khan is superior because Azog didn't have a dragon and dragons make anything ten times better.
Unless you're being eaten by one.
Then its not so great.