Both of them have a high level of security. It's just that with the existence of hard fork or block that can not be validated in Bitcoin, of course safer Bitcoin Cash. The evidence shows that Bitcoin still has a gap. It also indicates that the Bitcoin block is unstable. Unlike the Bitcoin Cash that does not need to worry about the hard fork or any disturbance. Usually, when Bitcoin is experiencing hard fork, the transaction will be paused. Well, here's where Bitcoin Cash comes in to support it.