Staying 1 night

Choice of Sofitel Munich (studio suite or delux room) or Kempinski at the airport (suite or superior room)

flight to US leaves next day at 11am

Where should I stay? will be tired and arriving at 9am from Africa.

Want to spend day in Munchen. What should I do/see? I love beer

Should I rent a car and drive to the castles? or is there a train?

hotel advice would help as they cost the same.