PSG vs Arsenal would surely be a tough one to predict. PSG barely won over Aston Villa and Arsenal surely is playing better than Aston Villa. PSG's recent league games has mostly turned into draw or loss even though they already have a large points lead.
Among Barcelona and Inter, Barcelona should easily win it as they have one of the best European team.
Inter has been on a very low chart lately. It is unacceptable for a team that was eliminated by Bayern Munich to suffer such a defeat in the league. Unfortunately, their chances for the Champions League are decreasing. Barcelona, on the other hand, tore Real Madrid apart. I am sure Inter will have a very hard time against Barcelona. If Barcelona wins, it will be the biggest surprise of this semi-final match. In my opinion, Inter does not have much of a chance.
It must be admitted that Inter is not in an extraordinary performance at the moment, in the local league they got two consecutive defeats and it was a crucial match that they should have won but CL is a different competition where a team will play with full spirit besides it must be remembered that Serie A clubs have a solid defense and deadly counterattacks so this is not an easy semifinal not only for Inter but also for Barcelona.