I haven't read the books so I don't know which is more accurate, but I also find myself enjoying Mr. Mikkelsen's portrayal just as much as Mr. Hopkins'. The two performances are different enough to make them enjoyable for different reasons.

I'm finding Mikkelsen's to be the more accurate of the two.

as much as I loved Hopkins' I felt like it was too.. dramatic, almost "Bond villain" dramatic. which is funny because Mikkelsen actually was a Bond villain.

but I find Mads to play a much more sinister, embodiment-of-evil sort of Hannibal and I really like that.