I personally don't think there is too much of a difference in where you sit. The characters make their way up to Cat 2 and 3 to interact. I have sat in all 3 Categories and it really isn't too different. It isn't a huge theater where the cheaper catagory is a mile from the stage or anything like that.
With that being said, Cat 1 is worth sitting in at least once, especially if you have kids.