If Arsenal lose to PSG in the second leg it will be disastrous as they will record another season without a trophy in a row. The one goal difference isn’t much, Arsenal have a good chance in the second leg to make history but seeing how poor they have been performing lately in the Premier League I fear they might concede more goals against PSG in the second leg.
PSG did it against Liverpool; they lost the first leg at home 1-0, and they went to Anfield and defeated Liverpool to qualify to the quarterfinal then; this is the same scenario against Arsenal. PSG won the first leg 1-0 at the Emirates Stadium. They had the opportunity to score more goals in the match because they had enough chances, but they couldn’t convert them, which is why the match ended 1-0. They played really well and capitalized on Arsenal's weak points.
Now Arsenal will be well prepared against PSG; they will play with their number six, Thomas Partey, and will also play with the hope of defeating a team they have defeated in the group stage. I don’t think it will be easy for PSG at home; they will experience the same pressure they put on Arsenal in the first leg because they already have a trophy this season while Arsenal doesn’t have any. If Arsenal wins the Champions League this season, it will be the best thing for the club.