I don't get some of the skins. So Bloodlord Vlad is Vlad if he was a blood mage?
And Blackfrost Anivia is Anivia if she had power over ice?
Don't get me wrong. The new voices and different blood/ice particles looks cool in a mirror match. "I'm like you! But in a different way sort of!"
If I had to compare, I'd say Soulstealer Vlad would be the superior of the two when you compare it with Bloodlord simply because it changes him.