Brighton can always give top clubs a surprise, but sometimes they can't handle the game when facing weak opponents. Brighton is one of the clubs to watch out for because when faced with big clubs, their play becomes more effective, sharp, and Arsenal have even had bad results several times. Head to Head, the two are even, with Arsenal and Brighton both winning 6 times. This means that Arsenal cannot underestimate this club, Arteta himself admits that until now he has always had difficulty dealing with the movements of Brighton's players.
True but Arsenal are coming to play them casually especially how they lost their last game against Aston villa, they are coming for a win to show their league contenders, now that it seems like Man City is having a difficult time they have to capitalise on every chances especially when they are not just contending against Man City but Liverpool (who I think will win the league this season), they have to win even Aston villa is on their tail, a slight mistake they will be in 4th position
There is no reason for Arsenal to try to underestimate Brighton, even though they are better in quality and they will play at home too, but still they have a bad experience when dealing with Brighton. Arsenal are also in a good position now and if they have to lose this match, it will be a huge loss for them. They have to stick to Liverpool who are at the top of the table with only 1 point ahead of them.
Brighton and Arsenal have the same number of goals, it's just that Arsenal are better at keeping their defense area, on the other hand Brighton has quite serious problems in the defense area, they can take advantage of it.