I would rather stay at the Sheraton due to the club lounge. Its one of the best and they actually cater to your every whim. I mean cooked to order breakfast, the massive coffee machine, full bar at night, and drawers stocked with beer and glass coca-cola bottles. The only down side is that the airport shuts down exactly at 10PM no exceptions, along with the S-Bahn. Most of the time I use cash & points, so it is really worth it.