As Rick stated you can use either, but, in most cases, lacquer thinner is usually best with enamel paints. It seems to mix better and provide better clean up. I would really avoid airbrushing turpentine. In fact, IMHO, there is very little use for turpentine in our hobby. One exception is using it to dilute oil based paints for washes, but then use can use odorless terpenoid, or, better yet, mineral spirits.
Hope this helps.
Mike M