I have the saddest news for Arsenal and their fans, if they really lose to PSG in Leg 2, what's so special about Arsenal? Still without a trophy every season, and in the EPL only runner up and also not special because positions 3, 4 and 5 all have UCL tickets.
0-1 difference over PSG still has a chance but it will happen at the opponent's home and I think PSG will be much more careful to keep maximizing the opportunity. Barcelona finally got a worthy opponent, Inter was underestimated but when we see the results of Leg 1 we will be quite sure Inter have a chance to give Barcelona a nightmare.
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's advantage is from the first match. They beat Arsenal with Dembele's early goal. PSG's intense front-field pressure at the beginning of the match shocked Arsenal and forced them to lose the ball. I think PSG will apply the same tactic in the second match and force Arsenal to make mistakes, as in the first match.
They already have a goal advantage. Nothing looks good for Arsenal and they didn't look very good in their last league matches either. No matter what, this Arsenal is the team that eliminated Real Madrid. It is very difficult to predict what will happen.