We are spending the whole day at The Land of Legends — does the car stay with us, or are the outbound and return booked separately?

With two separate transfers the driver drops you at the gate and leaves, then comes back at the return time you agreed. With a day assignment the car and driver stay with you through the day, so if your plans run long or you decide to leave early, the car is already there.

Which one suits you depends on how the day is planned. If your return time is settled in advance, two separate transfers are the simpler option. If you might call at the hotel during the day, move between different points of the complex, or prefer to fix the time as the day unfolds, the day assignment gives you that room. Either way the pick-up and drop-off gate is written into the booking — just note which setup you want when you reserve.