I go for the Hilton almost always when staying in paid hotels myself in Buenos Aires. And I continue to recommend the Hilton -- especially for first-timers to EZE and to those with very limited Spanish. (I recommend it to many others .... and take it myself. )

The Marriott has its own charm for some, but it's not what I'd recommend as being a great value if paying cash nor the most charming property or having the most charming location either.