AU vs GMU?

I recently got my acceptance letter to AU, which now gives me GMU and AU to choose from. ( I don’t expect to get into the other schools that I applied for.) AU may seem like an obvious choice since its private and stuff but I really can’t find out how big their science programs are? I’m getting into Biochemistry and I’m pretty active with extracurriculars so I expect to find opportunities within the campus, and hope to find research opportunities as that interests me as well. Help? I was set on GMU and I still love it but now that I’ve found out about AU its looking like a good option.