Help with some SUNY school info?

I’m a high school senior who was accepted to SUNY University at Buffalo and SUNY Plattsburgh. I pretty much need to know which would be better for a marketing/business major. I know Buffalo is absolutely massive compared to Plattsburgh which I don’t know if i’ll like or not. Also, how do SUNY schools look compared to a small, private school like Siena College? Is there really a big difference? Money isn’t an issue.