Hello Iftekhar Ivaan,
The choice between forward and reverse mapping is not based on the end product (as it is the same from both approaches) bur rather on what you, as a customer, are used to. If you would prefer to construct your database from already available classes in your project without the need to bother with SQL database modeling than forward mapping is for you. If you however have an existing database and want to have classes that represent your database 1:1 than you definitely should pick reverse mapping. I believe that you will find a lot of useful information in this blog post.
Please do not hesitate to contact us if you have any further difficulties.
the Telerik team