I use a variety of languages for live coding depending on what I'm trying to achive.
They are all very good live coding environments/languages and all, I mean ALL of them, are works of art in their own right.
SuperCollider
TidalCycles
Sonic Pi
Extempore
Hydra
Ixi Lang
Gibber
Punctual
Marching
Threnoscope
Improviz
... and of course many others exist that I've never explored!!!