Roll, slip, or bounce?

If we're talking idealized conditions then it depends on whether the collision is elastic or inelastic. If it is at all elastic, bounce. If it is fully inelastic, and there is no gravity or no friction, slip. (There's no normal force, and so no friction that can spin the sphere up to rolling.) If there is gravity and friction, initially slip, then rolling once the friction spins the sphere up to where rotation matches translational motion.