American version has better acting, editing, cinematography, score,
The Swedish version has only one good aspect: Noomi, but even she is not as close to what Lisbeth should be as Rooney Mara is.
It's okay to say that the TV series Swedish production (What people call "original film") appeals more to you and to the people who saw that version first
It's usually the version you see first the one that you prefer.
Yet Fincher's version is superior, you may like it less, but is superior in certain aspects. Not in all but in most.