and also..

    writing the script will take more time when writing in 
DP. maintance of the script will be difficult. 
        if some of the object properties are changing from 
build to build u have to update same in script also. but if 
u are using Object Repository u can update those property 
values in Object Repository. its one time change.or u can 
handle this in object repository with reguler expression. 

   like this we can say many examples.

if any queries:
nanda.dreddy@gmail.com