Hello! That's a very interesting question. As a Spaniard, I think Catalan is more similar to Spanish, since I am used to hearing both languages and I see more similarities with my language than with French.

However, it is interesting to think about this question. It could be said that in some aspects Catalan is more similar to French, obviously because of the evolution of the Romance languages and the powerful influence of French, such as some verb roots (Mengar / Manger - in Spanish Comer). On the contrary, it has nothing to do with the pronunciation of French, it is even complicated for a Frenchman and a Catalan to understand each other!

I hope that my little reflection has been useful :)