Pardon the Freudian undertones in the title. I like the convenience of a ball head for the tripod I'm planning to get, but I'm concerned that the 3-way is steadier for outdoor shooting with long exposure times. Suggestions for which to use? I'm getting into star/night shooting so I'm looking at 4min-2hr shots. My inclination is to skip the ball but I don't know if the criticism that they're less steady is fair or not.