Information is being considered as a resource in modern business. The quality of a business decision is in a positive correlation with the quality of available information. Business intelligence is a process of collecting relevant and accessible information and is one of the core competitive advantages in the modern market. Multi-dimensional data structures are the foundation of modern business intelligence. Analysis of such data often generates more questions than answers which creates a problem for the decision maker. Therefore, modern analytical solutions are more focused on data visualization than ever before. Using visual techniques, user can find out the essence of a certain data within seconds. There are a lot of tools that support data visualization in the modern market. Tableau and Power BI were chosen as market leaders, and were compared in detail regarding their functionalities. User experience experiment was also carried out to see which of these two performs better. This master thesis is trying to help users choose which visualization tool is the most appropriate for them or their organization.