To say that one authentic Buddhist practice is better than another, is no different than saying that the yellow pill is better than the red pill. A qualified doctor will prescribe the yellow pill to one patient, and the red pill to another. Both pills work - each one cures a different illness. But if the doctor prescribed the wrong one, not only may it not work, it might actually make the patient feel worse. Similarly, each one of us has our own disturbing emotions, attitudes, inclinations, interests, capacities, karma, and so forth. Just how a qualified doctor prescribes different medicines to different patients with different illnesses, a qualified Buddhist teacher knows what practices would be most suitable for each individual student.

--  Chamtrul Rinpoche