I honestly think Utah would have to be his first choice. San Diego State is probably a last choice. They're in a nobody conference that is about to fall apart with all the best teams leaving. San Diego State is also reportedly trying to leave and negotiating with the Big East (which itself is less than half a step above a nobody conference).
Wisconsin is in a big time conference, but they are a running team. Utah is also in a big time conference, but they are a passing team that is in desperate need of a QB. He's basically guaranteed the starting job, in one of the best QB conferences if not the single best QB conference. This is really a no brainer. If he comes back to school at all, Utah is the only team on that list who can provide exactly what he would be looking for. A guaranteed starting spot in a major conference, with a bunch of NFL caliber receivers, a very good RB, pretty good offensive line, an OC that has a history of making QBs look a lot better than they really are and even getting them Heisman awards, and possibly the best defense in the conference. Why would he choose San Diego State or Wisconsin over that?
Having said all of that, I don't care if he comes to Utah or not. I remember last year when Notre Dame was struggling with him as their starter, and then Notre Dame didn't lose another game all season after he got hurt. This year he flat out got benched. I just don't know if he is any better than Shreve/Hansen/Wilson. I guess with them being freshmen you don't know what to expect from them so it would be nice to have him around. But it's definitely not the end of the world if he doesn't come to Utah.