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PSG have the best chance to achieve both league trophies this season but the champions league is still a major doubt. While Inter milan have a good chance at the champions league, their league title race is a tight one as they have safe strong competition from Napoli. In my opinion, Barcelona have better chance at winning a treble this season.
PSG, Barcelona, and Inter Milan are teams that have quite strong dominance in their respective domestic leagues and they are perched at the top of their domestic league standings, while Arsenal may still be unlucky this season because in the EPL, they are only Liverpool's shadow. However, even so, with Arsenal qualifying for the UCL semifinals, this shows that Arsenal is a fairly strong team this season, especially Arsenal's qualification to the semifinals this season because they managed to beat Real Madrid in the UCL quarterfinals.
The ambition of the four teams to be able to win the Champions League title this season is quite strong, especially PSG and Arsenal who have never lifted the Champions League trophy throughout their journey, as well as Barcelona who have not won the UCL trophy for a long time. And the Allianz Arena which is the venue for the Champions League final this season, the place always provides surprises, where there is always a new team that manages to lift the trophy. So I hope that the UCL Trophy this season will fall into the hands of PSG or Arsenal.