As the Common saying:
«Every puppy is a Gazelle in his Mum's Eyes»
So, the majority of people will choose their mother tongue. Why? Because, it’s the language they master, and know how to express their feelings and ideas using it.
I don't agree 100% with the statements of «le Français est la plus belle langue car c'est celle des amoureux». Who said that only French people love? There are no frontiers to love, neither for other feeling. But, I’ve noticed that , the way French people talk make 'em look kinda Soft ( especially le 'R' dans Merci , bonjour ,...etc. what makes it hard to non-French speakers to pronounce :p but Germans and Dutch they do well with this :-) ) .
Finally, For me Arabic is the best language because it's My mother tongue :p ,and it's so so rich unlike any language I’ve known before ( for example : the lion has 100 names , and the word sword has 200 synonyms , I know only 5 ! ).
Merci et À bientôt,