I wouldnt compare Hall to Detmer, I think he is a better, more athletic version of Senior Year John Beck.
Both pulled off big wins, both are more quiet confidence as leaders as opposed to someone like Max Hall who was very vocal, and both really take care of the ball. Detmer was fantastic with his arm, putting up insane passing yards and TDs but he also had a ton of Interceptions. Both Senior year Beck and Jaren Hall are really good at making the right reads and avoiding the turnover.
Beck was also a Second round Draft Pick which is where I would pick Hall right now, although he could very well play himself into the First Round as the 3rd QB chosen.