Yes they are interrelated, all of them are related to relaxation of mind. In the practice of meditation, you try to relax and then try to focus your mind on a divine form. Yan Xin explained a qigong method to create an atmosphere conductive for meditation, it describes the superstitious practice of burning incense before images or statues of god. this stimulates the circulation of qi along the meridians and measures the passage time. Deciding the best depends on you, select the one which gives your mind the best relaxation.