As someone who's lived in both, I would say that Santiago does have very good nightlife & restaurants, but you do need to know where to go, whereas in BA you can find decent venues in most areas. Once you work out the places to go there's a lot going for Santiago over BA. Cleaner, friendlier people, decent prices for most things ...etc, they have lots of theatre and other live events, including Lollapalooza that I went to this year.
And Chile actively encourages new foreign businesses to set up in their country, they even provide start up funding for many of them.