I have 2 bikes and have commuted on both. One is an older tour bike that is my primary commuter because it has racks and panniers, a more up right geometry and wider tires. Works great as a commuter.
My other bike is more of a racing bike style (but not really a race bike). It is more aero and lighter weight then the tour bike, has a triple chain ring, but geared higher then the tour bike and has no rack attachments, so I have to use a backpack to commute on this one.