It sounds like you're in favor of UCF and more comfortable with the idea of that school. I didn't apply to or interview at FIU, so I'm not that informed about them, but I was extremely impressed by UCF. They seem like they're really heading in the right direction; the students seem very happy, the admin seems very enthusiastic about making UCF the best med school possible, and the facilities are amazing. Celebration Hospital is also awesome. The lower cost is definitely a plus, as well. Go where you're most comfortable going.