Uthar is a true villain, not a pansy like Yuthura in any respect. Besides, he has a reasonable backstory, by which I mean one without all of the recycled "troubled past" nonsense that passes for Yuthura's character. In both villainy and general character, Uthar is standard; his apprentice is sub-par. Both are far outclassed by Jorak Uln, though, because craziness multiplies awesomeness.
"There is something going on in time and space, and beyond time and space, which, whether we like it or not, spells duty." -Winston Churchill
"For of all sad words of tongue or pen, The saddest are these: 'It might have been!'" -John Whittier
"Apathy is death." -Kreia