both are pretty tough jobs imo. Purdue might be a tad easier just because the division they are in looks a lot easier to me on paper than the division that Louisville is in.
Louisville is probably easier to recruit to and it has less academic restrictions. But it's also in the same division as Clemson and although Florida State stinks right now, they aren't going to stink forever.
Not sure Louisville is a better job and if it is, it's not by much. Like everyone has been saying it will come down to whether or not Brohm wants to go home. Sometimes the pull of going home is too strong for people to overcome. Is Brohm the sentimental type? If he is, might just be too hard for him to say no to Louisville.