[Skunkworks] BEST E-COMMERCE APP.

As to the open-source e-commerce applications out there like oscommerce<http://www.oscommerce.com/> ,zen cart <http://www.zen-cart.com/>,cpcommerce<http://cpcommerce.cpradio.org/>etc which is the best as to a Kenyan e-commerce site,security wise for the customers and generally easier to administer.What are the pros and cons.Your suggestions will be highly appreciated.