Neither. For the harrier, the slower the landing the better. A vertical landing can cause serious damage to an ordinary runway, and to the aircraft. A conventional landing can have the plane touching down as fast as 180 kts and even with nozzle braking it can take a lot of runway. The typical landing at an unfamiliar field would be a fixed nozzle slow landing, or a rolling vertical landing touching down at roughly 60-100 kts.