Answer: This answer is dependent on philosophical perspectives.
Explanation: The debate regarding what poses a bigger threat to free will (predictability or unpredictability of our actions) is a complex and subjective claim to give an explicit answer to.
If our actions are unpredictable, this idea challenges the traditional standards of "free will" in that our actions may be the result of our subconscious control. On the other hand, the idea of predictability invokes a theory of determinism in which everything is essentially predetermined, therefore undermining the notion that free will exists.
Both perspectives are significant in contemplation of the nature of human responsibility. Philosophers and scientists are exploring things of such, some believing there exists a median between limited free will and and a world where the unexpected is 100% possible.