Which is better - Add a dimension or create more members in an existing

Which is better - Add a dimension or create more members in an existing dimension?
We are trying to figure out which can give us better performance in terms of calculations and retrieving reports - to add another dimension (entity/country) or add about 500-800 more members in an existing location/division dimension?
Thank you!

If you have BSO cube i would recommend to add in the same dimension where as ASO you can add members in a new dimension. Adding a new dimension is like creating a new cube you have to change each and every single calc scripts,report scripts,FR reports,Webforms and your rule files .... all the dependencies has to be changed manually . I think 500 members in the exsting BSO dimension will not impact the calc or retrieval times that much .

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