Comparative Effectiveness of Migraine Preventive Medications: The APT Comparison Study

This goal of this study is to compare three medications used for migraine preventive treatment. This study will compare atogepant, a newer migraine preventive medication, with two older preventive medications, topiramate and propranolol. It will be determined if one works better and is more tolerable than the others. Research participants will: * Be randomly assigned to one of the three medications. * Provide information about their migraine pattern using a daily headache diary and during research visits.

Inclusion Criteria: * Adults, 18-70 years of age at the time of enrollment * Migraine with aura, migraine without aura, and/or chronic migraine; according to ICHD-3 diagnostic criteria. (Those with daily or continuous headaches are not excluded.) * Migraine onset prior to 50 years of age * Migraine present for at least 12 months at the time of enrollment * At least four "moderate to severe headache days" per month (by patient self-report and then confirmed during four-week pre-randomization headache diary phase) A "moderate to severe headache day" is defined as a day during which there is a headache of moderate to severe intensity that lasts for at least four hours, or a day on which a migraine-specific acute medication is taken to treat headache. * If already taking a migraine preventive treatment, willing to continue with that treatment without dose change during the first 16 weeks of the study, including the 4-week run-in phase and 12-week randomized phase. * Not pregnant or breastfeeding * Women of childbearing potential must agree to use effective methods of contraception to reduce the risk of pregnancy. * Willingness and ability to provide informed consent. * Willingness and ability to complete all research visits. Exclusion Criteria: * Contraindications to taking atogepant, propranolol, or topiramate. * Currently taking atogepant, propranolol, or topiramate\* * Previously took atogepant, propranolol, or topiramate\* * Unwillingness to take atogepant, topiramate, or propranolol. * Current use of a CGRP-targeting preventive medication or beta-blocker * Migraine with brainstem aura * Hemiplegic migraine * Retinal migraine * Migraine aura without headache (exclusively) * Pure menstrual migraine * Trigeminal autonomic cephalalgias * Facial neuralgias * Secondary headache disorders (medication overuse headache is not an exclusion) * Migraine preventive treatment has been started or dose has been changed within 12 weeks prior to potential enrollment. * Used opioids or butalbital on five or more days per month on average for at least 3 months prior to enrollment. * Current or past epilepsy * Severe hepatic impairment * Moderate or more severe renal impairment \* Occasional as needed use of propranolol, currently or in the past, is not an exclusion, such as taking as needed propranolol for treatment of anxiety.