The only thing that seems to differ between the major schools of meditation is the point of concentration. Some traditions use mantras, others follow the breath, some have their eyes open, others have their eyes closed, some use simple words, others use prayers and the list can go on. Despite extravagant claims to the contrary, modern research has found no significant difference between the points of concentration at the beginning stages of meditation, which means it doesn’t really matter which mantra, word or phrase you choose to begin with. The main thing is to practice whatever meditation method that you have chosen; sit still and let the mind settle.