Yikes. I have a lot of my clients who are using Tableau, now moving to Power BI. PBI's got all the functionality in one product so no integration issues. It's cheaper than Tableau but cost is only part of the equation. It's the ability to connect to older on-premises systems like SharePoint 2010 is huge for many that aren't in the cloud or are hybrid. Also, the integration with Microsoft Flow is very attractive. You can kick off Flows from Power BI automatically, when a metric crosses a threshold, making BI self-escalating. I think it's easier to learn Power BI if you know Tableau as well. Lastly, Power BI Mobile is included and is the fastest growing area of use. Executives want everything on their phones and Apple watches. Hope this helps.