| Web user controls | Web custom controls |
|---|---|
| Easier to create | Harder to create |
| Limited support for consumers who use a visual design tool | Full visual design tool support for consumers |
| A separate copy of the control is required in each application | Only a single copy of the control is required, in the global assembly cache |
| Cannot be added to the Toolbox in Visual Studio | Can be added to the Toolbox in Visual Studio |
| Good for static layout | Good for dynamic layout |
| Web user controls are compiled dynamically at run time they cannot be added to the Toolbox, | Web custom controls are compiled code, |