Usually the cash prize is way less then the car value, for example one of the Tesla raffles were for any Tesla model or $50,000, there is an annual Toyota sienna raffle and if I'm not mistaken the cash prize is $25,000So I think just take the car
Unless of course you don't need/want a new car and don't plan on selling it because then you are out thousands of dollars in income tax on a supposed "free" car.
Why would you not sell the car at 2x cash value?