I had been asking myself the same question over the last few months, maybe even longer. The final selling point for me was lines of code, caused by the feature-

I had been asking myself the same question over the last few months, maybe even longer. The final selling point for me was lines of code, caused by the feature-richness of Scala. While implementing a few generic data collections and algorithms I need for my project, I realized that in Go this resulted in much more code than in Scala, or I would have had to sacrifice type safety by declaring everything an interface{} (sort of Go's version of a "void pointer" for C guys). I now have solved this by using Go as my favorite "scripting-like" language because it is so easy to bootstrap something there, and it is nice to quickly build efficient binaries and even wrap a C library. But to manage huge code bases and projects, for me the choice in the end became rather obvious. Particularly, with respect to all the magnificent capabilities starting from generics (~ C++ Templates), to higher kinds, the coming macros, etc. that help to create succinct DSLs and the general benefit "FP && OO", over "FP || OO", in the end made this decision obvious to me. And I have not even touched the issue of the gigantic collection of Java libraries and frameworks you automatically get by choosing Scala...