Advantages of SWT:

Provides backend by providing native look with backend widgets by supporting Swing programming model.

SWT could run Swing native objects which enables SWT to run on any Swing support platform.

SWT based application loads faster compared to Swing applications

The memory usage is smaller in SWT as it uses the shared libraries. The shared library loads only once for all SWT applications.

Provides the exact platform look and feel. Even with the skinned desktop, it looks and feel is also skinned.

Provides different styles for different types of menus