My brain is always pretty bored and jumps from language to language, so I learn a bit of Language A, then Language B, then switch back and forth. French has shorter chapters on the app I learn it with, Busuu, and I already know a good amount of Spanish (which I study in school) and Portuguese. However, while Italian might cause me to mix up Spanish, Portuguese, and Italian, it’s easier to pronounce. It also, however, has longer lessons on Busuu.
French is spoken in many countries, though, and I’m also LGBTQ if that makes any difference, since some people study languages from countries that don’t support/respect the group they’re part of.
French has more real world application, and in former french colonies it is still spoken a lot. Italian is closer to latin, which for someone already speaking spanish or portoghese might be interesting. I would not worry about mixing up, that might happen but is not really a bad issue, mostly a conversation item in my experience.