I am going to both, and Moldova. The serbs are ok to be honest, we should be ok out there in general.
Vienna has art museums if you are bringing the missus, and he she is from the Southside. But its a fairly sterile boring place to be honest.
Hotels aren't cheap in Vienna either. If I had to choose I'd pick Serbia over Vienna, but it will involve a change(most likely through Johann Strauss airport) as no direct flights.
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