When are you planning to go live? If it is June or later then I would recommend using SQL2016 SSRS. You have to look very closely to see any differences between SQL2008R2, SQL2012 and SQL2014 SSRS, but there are a lot of new things in SQL2016 SSRS that you are likely to find useful.
You can start your evaluation and development using a SQL2016 CTP, and hold off going live until SQL2016 RTM, rumoured to be in May.
Original author: SQL Server FineBuild 1-click install and best practice configuration of SQL Server 2017 2016, 2014, 2012, 2008 R2, 2008 and 2005. 1 Dec 2016
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Disclaimer: All information provided is a personal opinion that may not match reality.
Quote: "When I give food to the poor they call me a saint. When I ask why they are poor they call me a communist." - Archbishop Hélder Câmara