I have a special place in my heart for F#. While I do a lot of Scala these days, professionally and open source, F# was my first introduction to functional programming that eventually got me into Scala.
F# and Scala are extremely similar languages: garbage collected, hybrid OO/FP guest languages hosted on a widely-used runtime. Even though the superficial syntax is very different, and the advanced language features they provide are pretty different, the core experience of modelling your data as "dumb" data structures and transforming collections of data using higher-order functions is almost identical.
Scala ended up winning out for me due to a broader ecosystem (Much more OSS Java than OSS C# out there), better tooling (Visual Studio's F# support was always disappointing...), and easier interop (F# <-> C# feels a lot more clunky than Scala <-> Java). But I can easily imagine an alternate universe where I'm happily writing F# all day, and almost nothing would be different from my current work writing Scala.
F# and Scala are extremely similar languages: garbage collected, hybrid OO/FP guest languages hosted on a widely-used runtime. Even though the superficial syntax is very different, and the advanced language features they provide are pretty different, the core experience of modelling your data as "dumb" data structures and transforming collections of data using higher-order functions is almost identical.
Scala ended up winning out for me due to a broader ecosystem (Much more OSS Java than OSS C# out there), better tooling (Visual Studio's F# support was always disappointing...), and easier interop (F# <-> C# feels a lot more clunky than Scala <-> Java). But I can easily imagine an alternate universe where I'm happily writing F# all day, and almost nothing would be different from my current work writing Scala.