We're heading to Miami on a business trip in late September. We're spending most of our days at the Miami Beach Convention Center. Where should we stay-Hilton, Starwood or Marriott? And which locations should we consider, close to good restarants. No car rental. Have elite memberships with all 3, Plat with Starwood, Gold with Hilton and Silver with Marriott. 2 free nights for any Hilton certificates. Very confused.