I am so surprised to see no replies by one Million steemers. Yes it is an important question. I think a really neutral language as Esperanto would be the right choice. All people on earth would have the feeling of being included. (lingual justice), and it is the most easiest language to learn.
As you are favorized Hebrew, I have to think about Zamenhof, the Jewish creator of Esperanto. How he was so wrong. As he first thought about a unifying language he tried to solve the Jewish problem. He even thought that Yiddish could be the language of all Jews (he wrote the first grammar book for it). Than later as he was involved in the Zionist movement he thought Hebrew could do. But he gave up that idea because it wouln't work, he thought. Strange isn't it?