I'd rather hold both of them, I know there's a lot of benefits of holding bitcoin instead of cash for ex. if you have cash or money in the bank it will take time to gain interest but if you are holding bitcoin for sure you will earn something or lose just little amount. The reason why I also want to hold cash its because in our country not all merchant accepts crypto/BTC and if there are emergencies or needs I can use my cash in hand.
That's a wise choice. Although bitcoin is very profitable, we still need cash at certain times. For example when there is no internet connection. In addition, although later bitcoin is legal, the government still has its own reserve currency as a form of sovereignty.