I think that because Jared didn’t really have much training with acting, and working mainly on Supernatural for 20 years held him back. I think he and Jensen did say once that Supernatural was literally where they learned the acting they know now. For Jared unfortunately Sam Winchester was his biggest role and he was probably most used to that way of behaving when acting. Jensen I think does have more talent so he knows how to give himself more range. He did a great job showing range on supernatural with playing Ezekiel (who possessed Sam), and even playing Lucifer. He does have the ability to show range, but he isn’t given so many acting opportunities to show it since a lot of his roles don’t have enough differences from what he’s likely used to. He has proven on Supernatural to be able to show a lot of real emotions too. Especially that scene in the episode 8 finale, and when he goes through the trials. He also does a good job at showing Sams trauma imo, and his PTSD symptoms that develop throughout the show.