Other Car Rental Programs (ie. Alamo, Enterprise) - Premium car rental SFO Enterprise

I am planning to rent a car @ San Francisco International Airport (SFO) and travel to Yosemite national park.
Has anyone had any recent experiences with premium or standard cars at enterprise? What cars were available at the lot?
Did you like the car you rented?
What grade (premium, standard or intermediate) do your recommend?

Thanks:)

Intermediate = something like a Corolla or Caliber
Standard = something like an Avenger or 200
Fullsize = something like a Malibu or Camry
Premium = something like a Charger, Impala, or Altima

Enterprise classifies cars by their cost, not size or even MSRP, so the exact size of your vehicle can be somewhat unpredictable...