Iran is a lot more dangerous than North Korea. North Korea doesn't want to use their nukes except for blackmail. Iran really and truly wants to nuke Israel, the U.S., and the U.K.
Don't believe Iran can reach anyone except Middle-East and I don't think nuking Israel would be good since winds would move nuke dust across entire middle east.
This is different from Korea, Clinton paid Korea not to build weapons so, they did it in secret (while taking the money) Iran has at least always said it is, was and will develop nuke technology.