Paper is interested for anyone such as software developers,students, designers and companies who want to choose bestplatform.Paper provides powerful comparison between .NET webapplication using ASP.NET and Java application using JSFtechnology for component based development. The choice ofsuitable platform for future is not easy, both has its strength andweaknesses. Web applications implemented within specifiedrequirements using component technology such as EJB and ClassLibrary. This application helps to compare both platforms againsteach other and provide support to target audience to takedecision while choosing platform. Although both .NET and J2EEhave covers a great deal of platform fields, paper will especiallyfocus on components, programming languages, tools andtechnologies. At the end, we discussed our point of view whileworking on both applications using component and providewhich platform is easier and user friendly for target audience.