Window Application: It has rich GUI and to be installed specifically in a machine for execution. But this drawback is resolved using click once deployement in Visual Studio. Full access to everything – less security.
Web application: It will be exposed over intra or internet and can be accessed via URL and both has the capability to use Databases. it is great because they don’t need to be distributed. Session-management, user contexts / security, and other things tend to be a lot messier than with desktop applications.
If u want to give the whole world an online catalog, go with a web appl and if u want to do any serious data entry work, it is better off with a real Windows appl.