Sarevok was always a better character from the start, looked way more evil, had a much more "scary" voice, was much more malicious and evil in terms of storyline:
Sarevok: Wants to make a war in the sword coast, potentially killing thousands, and rising to become the new god of murder and dosent give a f**k if you try to stop him.
Irenicus: Wants you're soul to rejuvinate himself then to get revenge on some elf buddies who exiled him.
Petty revenge? Nah, give me sarevok any day!
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My hopes lie dashed,
Crushed from high above,
My dreams lie shattered, my heart broken,
A casulty on a battlefield called love.