ABA's online training is free with your institution's membership. While I haven't used BVS in several years, I noticed after we switched that the courses with ABA are more comprehensive. (Employees say they are harder.) However the reporting and enrollment options aren't as broad. IMO, BVS was more user-friendly for both students and administrators. But for us the decision was based on budget. Hope this helps! Good luck to you.
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We're all here 'cause we've lost control.
Innerpartysystem