It has something called story and open world. Something destiny was supposed to have.
Oh and the loot system isn't shit
EDIT: seriously? Does no one ever read the OP anymore? Or does everyone just have a trigger once they see the title?
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There is a big difference, Witcher is based off of a book series and Destiny is not, the lore in Witcher 3 has been set in stone by the books, Destiny just came out 7 months ago.