When deciding whether to use the basic charts, graphs, and visuals that come with Power Apps out of the box or to go with a more powerful software like Power BI, it really depends on your business solution and requirements. For example, if in your solution, you want to add some basic graphs and charts to improve the apps overall look and feel while adding some visual flair for your users, Power Apps has you covered.

On the other hand, if your solution requires in-depth analysis of your data and robust visuals, Power BI is the best product to use. Keep in mind, with Power BI, each app user needs another license on top of the Power Apps license. This might be a small price to pay if your solution relies on intuitive dashboards, charts, and graphs.