Request for advise whether to use WEBSERVICE or WCF SERVICE for mentioned task

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ASP.NET

WCF

webservice

Hi,

I am developing an WEB Reporting Application which will allow users to specify the datasource and then the data will be copied to our ReportDatabase.(Here table would be created dynamically in the ReportDatabase and data from source would be dumped into it for Reporting on WEB).

Since the table generation is dynamic,I cannot use Entity framework since i am not able to know the entities which would be added in Reportdatabase.

I want to pull data from database and display on Web Reports in a grid.(A user will browser the report,he will specify which columns should be displayed in Grid.when user
clicks on Report, a Call should go to WCF or WEBSERVICE and then data from db should be brought to UI).

So , should i use WEBSERVICE or WCF SErvice for this.

What return type should be used so that i can easily bind the data to grid.

I am not able to decide the architecture and WCF or WEBService for this.

Please feel free to ask any clarification.