- Productivity. Bulding stuff in Clojure is not only joyful but also can give you real (not imaginary, not theoretical, but real, measurable) boost;
- Concise syntax. Less code - less bugs;
- FP. Immutability by default is something that once you get used to it, it is hard to imagine having to write code without it;
- REPL. I mean real REPL, not some kind of crippled "interactive shell". e.g.: Jupyter is interactive shell, Clojure (just like any other Lisp) has a "real" REPL;