When considering a candidate on an F-1 + OPT, what should be our expectation of their need for H1B sponsorship? What are O-1 and National Interest Waiver succes

When considering a candidate on an F-1 + OPT, what should be our expectation of their need for H1B sponsorship? What are O-1 and National Interest Waiver success rates for recent PhD grads (in computer science)?