If you give me the choice of Aaron Murray or Garrett Gilbert I'd go with Murray. He's played at a high level for a couple of years in a much tougher conference where he is playing defenses that are much better than what GG has seen since his days at Texas.
The fact is that although we are all fans of GG, he has only had one season of quality QB play. He wasn't very good last season and was dreadful at Texas. Yes this year he's been very good but the sample size is pretty small.
Don't get me wrong I like GG, but I'd take Aaron Murray over him even w/ the injury.