Although i like the rooms much better at the Westin, I usually choose the Sheraton. I'm just really not thrilled with the looks of sheratons in general with their gold/yellow/beige theme. Although both are walking distance to the old town, the sheraton is closer. There's a nice restaurant nearby, "The Luggage Room", that has, IMHO, great pizza. It was actually the luggage room for a stop on the old train line which is now the metro.