Bailey stood out. I realize that a scrimmage where the QB can't get hit or isn't supposed to run much is going to take away some of Maurer's skillset, but I still think Bailey looked better. Considering what we've seen from actual playing time in games plus this spring game, Bailey seems to be getting better each time we see him. He showed under pressure last season that he was capable of getting rid of the ball quick and also could run for a few yards at times. He's not an escape artist, but he's not a statue. I think he's the best passer on the team and also might be the best at protecting the ball right now.
As far as Maurer is concerned, he's got a massive amount of potential and can flat out make plays with his arm or legs. He could easily be the guy, but he just seems to be inconsistent. He'll only get better, but multiple reports during spring have said he's the guy most capable of wowing you with a big play but also frustrating you with a mistake.
I personally think you have to give the edge to Bailey heading into the summer, but the gap is small and could quickly shift. Hooker is a guy you like to have as a backup. He's got experience, he's mobile, and he can be productive throwing the ball...not extremely productive, but he's capable of at least providing a threat to complete some passes.