I did a study on where the first named systems formed in the Atlantic between 1980 and 2009...first, here is a tidbit from my file:
***Subtropical and unnamed storms are NOT used in this study (in the case of the “A” storm being subtropical entirely, then the next storm is used)***
***If the system was first designated a subtropical cyclone, then became tropical, the date, lat/long and max wind speed used is for the TROPICAL time only***
***Tropical depressions are not used, only tropical storms or higher***
Despite the Caribbean being considered the early season breeding grounds, the results were a bit surprising, with the area I labeled as the "Northwest Atlantic" winning over the Gulf of Mexico (followed by the Caribbean/Central Atlantic). Remember, this is for the first named TROPICAL system only.

Granted, I know this is only for the first named storm, but still somewhat relevant and quite interesting.