The security features were a major selling point. No other product offered the depth of environment control, i.e. module access, data access, etc.. For example, in Business Objects data access can be set at the user level, i.e. for Jane Doe always generate the 'sales.state = California' where clause when Jane runs a query that accesses the sales table. Also, Business Objects is more adept at complex queries, i.e. pulling data from diverse data sources into a single report, correlated sub query SQL generation, union/minus/intersect, etc.. Some products, i.e. Micro Strategy, require very specific database structures, sometimes requiring a redesign of the database. Business Objects does not.
Another selling point is user friendliness. We've found that a well-designed universe can be very successfully navigated and utilized by non-technical business experts.