When it comes to comparing Power BI with traditional BI tools, there could be several differences. Power BI is a next-generation Business Intelligence tool that is facilitated with cloud and self-service opportunities.
The very first benefit of Power BI over a traditional one is - Power BI can be configured for on-premises as well as on-cloud i.e., Software as a Service (SaaS). Users can access their data (hosted on Microsof's Azure Server) simply using their browser. Cloud-based Power BI solution eliminates the upfront cost, hardware investment, and lowers the license pricing.
The Next but not the least benefit of Power BI over traditional BI systems is Self-service facilitation. With Power BI, you can create custom reports, create your own visuals, and can extend the existing Power BI reports which are not possible with traditional business intelligence systems. Using traditional BI configuration, users can make decisions based on guided analytics or reports only; they can't make their own reports or perform customizations, etc. Moreover, Power BI reduces your costs, stimulates the development cycle, and accelerates user adoption.