Areas of the world when French will be useful due to historical reasons:
-Canada
-France (duh), some european countries like Switzerland, Belgium and Luxembourg also speak it
-Africa
-Some parts of asia, notably around former Indochine, now Vietnam
I might be wrong, but don't believe Italian is as widespread.
As I don't speak italian, I can't compare the languages though, but there is more to a language then just how it sounds.
Language defines how we think and the concepts that serve as basis of ideas and imagination, french words tend to have powerful connotations that makes their wordplay very vivid and colorful but also very tricky due to its nuances, by comparison, speaking of the languages i'm fluent in, english is much more straighforward and functional and spanish is more passionate, a lot of the times downright agressive imo (goes with the passion i guess).