Since medicines can have different effects for different patients, which one works best may depend on the patient. Likewise, which one is prescribed may also be based on the personal preference of the patient and/or prescribing physician. And, while side effects are rare, if you have a side effect to one of these meds your doctor may prescribe one of the alternatives.
However, there is one exception. Both Singulair and Accolate have been found to work well for asthmatics who only have asthma symptoms when exercising. These meds may be used 1-2 hours prior to exercising to help with excercise induced asthma.
Hey, if you have any further questions about Leikotriene blockers or any other respiratory medicine, feel free to ask in the comments below or email me at firstname.lastname@example.org or in the question section at MyAsthmaCentral.com