Hi,
The main difference is autonomous do not require a controller to control the AP. the LWAPP require a WLC wireless controller to control all of the AP but provide ease of management for the communication / setting between APs.
As the name indicate, the autonomous means manual configuration, LWAPP means the WLC will push the config to all the APs in one shot..
Here is the link as well
http://www.cisco.com/en/US/products/hw/wireless/ps430/products_qanda_item09186a00806a4da3.shtml
Lemme know if this answered your question
Regards
Surendra
Regards
Surendra BG