Hey, I take it since you are making this poll that you got accepted off the waitlist at Case. Congratulations!
I interviewed at Case and was accepted and then promptly declined. Even though, I declined, I simply love the school. The students are awesome and non-competetive and so friendly. The facilities were great, I just liked the overall atmosphere. The reason I chose to go to UC was #1) loved UC even more, 2) cost, 3) didn't like Cleveland too much.
Although I was offered an interview at OSU, I cancelled it because I had been accepted to UC and had just heard so many negative things about their program. The most prevalent comment was about the three different pathways and the segregation and animosity it created between each other.
So, I would think your decision would hinge on financial aid offers of the two schools and the location of your family. If you got a better deal from Case, then take it. I think Case is the better school, but believe OSU is not far behind. Good luck with your decision!