Clearly both missed so it was no good for their teams, but Messi's effort was better than Barkley's.
I 've seen some pens taken high saved, especially when hit centrally ! In that case if the goalkeeper does n' buy it's an easy save.
Barkley's shot was not central but it was a bad one.
As we all know the world's best pen takers strike low and they also sense the keeper's movement and then all they have to do is a tap-in (Hazard-Didier).