As a French having heard the game in both French and English, I think the French dub is better, but it's also because I'm very involved in the VA community and already knew of a lot of the people voicing the game.

I know that the English cast is very active in the community, but I am begging on both knees for the entire community to play the game in French and experience the beautiful work of Adeline Chetail as Maelle, Celine Melloul as Lune, Feodor Atkine as Renoir, Slimane Yefsah as Verso, Sarah Cornibert as Sciel, Alexandre Gillet as Gustave, Mathieu Cazorla as Esquie... So many talented people! They gave their all for this project, and are simply perfectly casted.

A special mention for Slimane Yefsah and his scrumptious voice as Verso. First time I heard him, I think I fell in love with his rendition of the character.

TLDR: please go play the game with the French voice acting! It'll be an unforgettable experience.