SPOILER:
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You will get to kill a lot of Shadow Thieves instead of Vampires....

Basically, siding with the undead is the more "evil" path of the game, but either way you will travel to Spellhold in later chapters.
A side note: your sig is kinda large, you may want to shrink its size a bit.
P.S. Welcome to the board!
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Long live H22A1!!!!!