Stanford Court is definately a nice, swank property. However, there is no concierge lounge and it is at the top of a huge hill (although there are cable cars). Marriott SFO is a huge hotel, but the rooms are typical. But the concierge lounge is nice. It is also in a convenient location, close to Metreon and shopping. If staying there, definatley go for drinks at the bar located on the top floor (forgot the actual name). Terrific few and atmosphere.
At the Stanford, try to ask for a room that does not face California or Powell, otherwise you will hear the cable cars all night.
Hope that helps.