Regarding Barry, we don't have a lot to go off, but he hasn't produced any moments of magic in his limited minutes so far, yet also hasn't missed any gilt-edged chances in front of goal.
Beto has scored once and missed a bunch of other chances or cocked up some decent opportunities where he's made completely the wrong decision, miscontrolled the ball, strayed offside which is a huge weakness to his game, etc.
Against Liverpool though I'd still go with Beto due to his physicality, but if he again fails to impress it's Barry time for me given it's the only alternative.