Uruguay has a higher murder rate than Argentina [0]. This is also true if you compare the city of Buenos Aires with Montevideo[1], though exact numbers are harder to find and I don't have a reference handy. If Buenos Aires has more crime(I have never been able to find numbers on amounts of roberies), it is not as dangerous.
[0]: https://en.wikipedia.org/wiki/List_of_countries_by_intention...
[1]: http://www.buenosairesherald.com/article/156754/un-argentina...