I recently made Sixt Platinum (not via a status match, so should be eligible for the upgrade) and have a two-week trip in California coming up (picking up the car at LAX, returning at SJC). I've reserved a STAR (Mustang/Camaro) - which class can I expect from the Platinum double upgrade in the US, assuming everything would be available on the day?

When making the reservation, other convertibles available were a VW Beetle (CTAR), Buick Cascada (ITAR), Audi A3 (PTAR) and BMW 4 (LTAR). The VW and Buick would have been cheaper so just from looking at what's left, it should be the BMW?

Thanks!