Obviously I love SFC. The upgrades have helped make it a good looking arena. I would say it, for a P6 arena, is probably slightly above average. Of course, when it's full and full of emotions, not sure theres many arenas I'd rather be. I would imagine Oregon's is nicer (they have a pretty interesting court design, at the very least). Likewise with training facilities. Eugene is also a much nicer looking town than CU, at least in my opinion, though downtown Champaign is extremely nice. Now, academics wise, UIUC blows Oregon away, especially in Comp Sci/Engineering.
Wildly guessing, doubt any of the above played into Okoro's decision. I believe play style, roster makeup, and coaching were most likely the largest factors. If playing time was really important, you cant tell me Okoro wouldn't be wearing orange and blue next year. Altman just pitched better.