Shaw has the mentality and experience being out of the team and working his way back in and now a top LB. Shawberto is immense. Tierney is good quality, but still has to improve and put in performances like Shaw many times over.Tierney has shown what he can do on the pitch, he's not on the pitch for longer periods of time than Shaw because of injuries. But when he's there he's a game changer. I wouldn't say he's better than Shaw, because I rate Shaw very highly. But there's hardly anything between them. I think you haven't seen too much of Tierney, which is understandable seing as you're a Utd fan.