I've always viewed Bento as the personal Database application while Filemaker is the enterprise version. That said, Filemaker 12 has some pretty slick improvements to it, and Filemaker GO is a really exciting concept.
Depends what you need your Database to do, and how you are using it.
Having been forced to use Microsoft products in my career, I'd say it's the Mac answer of Access between SQL Server.
2011 Mac Mini (Lion Server) 2.0 i5 8GB/500GB
2011 MacBook Pro 15" (Mountain Lion GM) 2.4 Quad i7 16GB/512GB OCZ Vertex 4 SSD
2010 MacBook Air 11" (Mountain Lion) Core 2 Duo 2GB/64GB
1999 iMac (OS 9.2) PowerPC 750 G3 1GB/64GB
Airport Extreme & Airport Express
iPad 1/32 GB Wi-fi
New iPad/64 GB Wi-fi
Apple TV 2 (720p)
iPod Classic 80GB
iPod Nano 16GB