BPC vs Business Objects for reporting purposes

We are in the middle of a large SAP implementation. For Planning and Consolidation, SAP BPC 5.1 is being deployed. But for Reporting (both high level management reporting as well as detailed business reports) we are faced with a choice between BPC and Business Objects.

We understand that BPC shines in terms of usability and customization, however there is the feeling that BO might perform better for more detailed, analytical reporting duties (as well as being able to handle more raw data).

Are there known practical limits of how many records BPC can manage, or how many dimensions it can articulate into? Does it perform better or worse than BO on static and dynamic reporting duties? In terms of SAP roadmap, is there a clear niche for both products for the next years that we are not aware of?

In order to support a decision (and perhaps a compromise between both products) we need help understanding the strengths and weakness of both these products relative to each other, always in the context of Reporting.

Could any of you experts help shed a light on this subject?

Thanks in advance!