Bento is FileMaker with less functions... However it does come with nicer templates. FileMakers templates are lame.
If reporting is an important feature to you, then I would recommend Filemaker.
Filemaker has a much deeper feature set when compared to it's very little brother Bento. Bento is much easier to learn and use for a newcomer. I'm speaking from experience here - I have both, and have only been using them for a year.
Taking into consideration my last sentence, I still find myself relying on Filemaker to run my consulting work.