What is the difference between Customizable Forecasts and Collaborative Forecasts?

Customizable Forecasts	Collaborative Forecasts
The forecast categories can reflect aggregate information.	The forecast categories only display information for that specific category.
Territory Management is supported.	Territory Management is not supported.

Kindly use the below link to know the complete difference

https://help.salesforce.com/HTViewHelpDoc?id=faq_forecasts3_whats_difference_between_versions.htm&language=en_US