Its great to see the R with Tableau. Microsoft is also announced recently to integrate the R with SQL Server 2016 and Power BI. Will be great if you highlight feature where it gives right comparison to choose Between the peers. Thanks

Data Quality, Data Volume, Frequency Of Update (Schedule) and Cross Object communication In an overview. There could other factors as well but primarily I will go to evaluate this.

But I think the cost is a big factor to go for biztalk or ssis

1-Business ( Answer from the Business Users) 2-Development Effort. 3-Cost of the product 4-Maintenance. 5-Technical Support.