[fiddlerwoaroof]

My impression is that Eta is a better choice, if only because it is compatible with a wider variety of Haskell libraries.

https://eta-lang.org/

[0815test]

Eta is a better choice, if you care about Haskell compatibility in the strictest sense. Frege doesn't really pursue this, but the flip side is that it optimizes for working as smoothly as possible with the JVM ecosystem.