They both sound fine.

Hola Bárbara. Similar to Beth's comment, both are technically correct and you can say either. You may also hear "leave the planet" which is the way we would likely say it in the U.S. But again, both are correct. -

Hi, Bárbara! In my opinion both phases have the same meaning, but I believe the first one is most used. It sounds better. Have a nice day!

I think I can use both.... and I agree with you "This world" sounds better. Thanks :)

Sorry for the confusion Barbara, it was meant to be a joke. I was only saying I don't want to leave this world behind! Nothing else, no hidden meaning. Regarding the actual question: I think both are ok, but I would change "the world" to "this world"... then again I'm not a native speaker, so maybe take it with a grain of salt and wait for someone else to answer.