Don't really know anything about the Nic Cage movie, but my impression of the Weird Al movie was that it was going to a stylized over-the-top parody of the genre of biopics of music stars and not so much something like those awful reference-vomit "parodies" that they used to churn out (all the ones that came out after Scary Movie). As a lifelong fan of Al, I'm hoping for the best.