Depends on your goals. I’d say learn the one you have the most use for. If you don’t have a use and are just learning for fun, then pick the most interesting one. If you’re learning intending to acquire the language as quickly as possible, then either Italian or French would be good choices.

I am learning Chinese (mandarin, aka 汉语, aka 普通话) and I personally find it very logical, interesting, and fun as a native english speaker who used to be conversationally fluent in Spanish. There are definite difficulties with the language (soooooo many homonyms, characters (汉子) take some getting used to, tones, etc) but if you learn it, there is a lot of reading material and media that will become accessible to you. Additionally some things about it are easier than other languages - like the grammar is very simple, you don’t have to worry about conjugations and tenses as much. Also, I think that it provides more cognitive benefits because of how different it is to romance languages.

汉语是很酷。我推荐你！