Porto was just lucky with their win against Arsenal because the gunners dominated the match unfortunately couldn't capitalize on their dominance of the game by being wasteful in front of goal probably due to inexperience of their players, however I don't think Porto can defend their lone goal advantage at the Emirates it's going to be a different ball game because Arsenal would launch massive attack to win the return match knowing that failure to win means they are out of this season UCL, of course Porto would deploy a defensive tactics because of the attacking prowess of the gunners and utilize or adopt a counter attack
How could that be luck? Porto achieved it with great difficulty and even until the last minute they didn't give up. Arsenal really deserved to lose because they couldn't produce results equivalent to what they performed in the English Premier League and once they lost they had to regret it because it was in a bigger competition. I still believe that Porto will do the same thing at home to Arsenal and if Porto succeeds in widening the aggregate then Arsenal will be eliminated in the Champions League.
FC Porto escaping with a lone goal in their home is impressive, kudos to them but I don't think they can repeat that when they visit Arsenal at Emirate in second leg.
Arsenal is stronger at home
Arsenal was always getting good result when it was coming to the playing at home. It seems like that porto is gonna face the biggest obstacles in this round. Emirate is very often making its opponent scared. It's caused by arsenal could always perform perfectly when it comes to the playing at home.
Things are going to perform even better compared to the last season. It's perfect and i think that arsenal will try to perform even better compared to the last season. Porto has no choice other than use fully defensive strategy. Doing parking bus will be saving the club from the lost.
That's the only possible solution for porto to anticipate the fully attacking line owner by arsenal. Other may have different opinion regarding this but the result from the first leg is enough to give clue if arsenal will be playing better.