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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.
Even though they are still favorites, Arsenal are still under pressure after achieving poor results in the first leg. Porto which is still consistently maintaining its performance, only needs a draw in this match to qualify for the quarter-finals. Porto's last two matches were also very impressive, they managed to score 8 goals without conceding. A strong defense was Arsenal's threat in the second leg, Porto only needed to close the space so that Arsenal players could not easily build attacks.