web user control: where it predefined attribute functionality where it RESIDES in control LIBRARY
web custom control: where it is defined by user itself and store in a custom library
Web User Controls:
1) Easy to Create
2) Limited support for consumers who use visual design tool
3) A seperate copy of the control is required in each application.
4)Cannot be added to TOOLBOX in Visual Studio.
5) GOOD for Static Layout.
Web Custom Controls:
1) Harder to Create
2) Full support for consumers
3) Only a SINGLE copy of the control is required in the GAC
4)Can be added
5) Good for Dynamic Layout.

web user control: where it predefined attribute functionality where it resides in control library
web custom control: where it is defined by user itself and store in a custom library
Web User Controls:
1) Easy to Create
2) Limited support for consumers who use visual design tool
3) A seperate copy of the control is required in each application.
4)Cannot be added to toolbox in Visual Studio.
5) Good for Static Layout.
Web Custom Controls:
1) Harder to Create
2) Full support for consumers
3) Only a single copy of the control is required in the GAC
4)Can be added
5) Good for Dynamic Layout.