I've lived in the Cleveland/Akron area my entire life and I have to say that if its a toss up between Cleveland & Columbus, I would say C-bus.
My brother went to OSU, as did several friends of mine (I now sort of wish I had as well - Im 28 now) - they all loved it. TONS of things to do down there.
I guess it more so depends on what you are looking for school-wise and what will fit your personality best. OSU is quite a large school but it has a ton of different options. I don't really have an opinion on the Cleveland colleges (I went to the University of Akron which I loved).
Take advantage of the tour from your bf's brother defenitely. That is the best way to gauge whether or not you will get a good vibe and if you feel you will jive with it.
I just cannot bring myself to give Cleveland too many props despite knowing the area for so long. It's just been so disappointing. They are trying to work on it though.
But, like I said - you will know. Visit OSU, take it all in. I toured quite a few campuses when I went to college - but the minute I stepped on UofAs campus, I just knew. You might find that you will 'just know' too
