Hello all. Apologies for the annoying/naive post - TBH I never really rent a car above the very cheapest or the occasional SUV if we're going over some slightly tougher terrain, so this is new to me.

I'm Platinum with Sixt. We're driving from San Francisco to Las Vegas next year, and the difference in price between compact and 'extraordinary' is negligible, so we're going to get something nice. I've never heard of 'extraordinary' before - I assume that "Extraordinary (BMW 5 Series)" won't be interchangeable for an 'extraordinary' SUV? They have "Premium (BMW X1)" and "Luxury (BMW X3)" and almost the same price as the 5 Series - the missus favours larger cars, but I'd really like to go as fancy as possible. Does anyone have any advice/suggestions? We'd be picking up at the Fairmont Hotel rather than SFO as we're staying in the city.

And what is the 'ranking' of these cars? Premium, then Luxury, then Extraordinary?

EDIT: Didn't want to miss the price, so went with the Extraordinary BMW 5 Series