Looking at the odds, Arsenal remains heavy favorite.
It's really worth to bet draw or Porto to win, looking at their previous match, Arsenal was struggling to beat Brentford while Porto is still strong until now. So I expect this match should ends in draw, Porto don't have to win while Arsenal will try their best to win.
Porto will try defensive tactics because they already have the advantage in the first leg. Porto can play very well with their defense. This can be seen from the first leg. But Arsenal played as host in this match. That will give them additional morale and motivation to win the match. Even though it was difficult to win the match against Brentford, I think the match against Porto will be different because Arteta will really prepare a strategy and Arsenal will go all out to win the match. I predict Arsenal will progress to the next round.
In fact, Porto was able to beat Arsenal in the first leg thanks to their far more experience playing in the UCL than Arsenal. So it is not surprising if Porto can overcome a team as strong as Arsenal in the first leg. But I am also confident that Arsenal will eventually progress to the next stage. Because Arsenal has also recently had an increase in goal productivity. And Arsenal have also strengthened their defense more recently. Even in the match against Brentford, we could actually see Arsenal almost completely controlling the match. And Brentford even they continue to struggle to get out of the pressure. It's just that Brentford's defense is also very solid. So Arsenal were having quite a difficult time. But in the end Arsenal still won. I am sure that in the Arsenal vs Porto match there will be more than 2 goals and I hope Arsenal will score 3 goals. This seems excessive but we'll see whether Arteta's troops can be relied on at home or not.