Barcelona have the advantage because they beat Benfica 1-0 in the first leg.I think Barcelona will not lose in this home game.Barcelona will be the one to go through.
Liverpool had a good chance in the first match and managed to win with a goal in the last minute.This time things may be different because PSG was really dominant in the first match and wasted many positions.So if they can show the same game again, they may have a chance to pass the round away.